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	<title type="text">Alexandra Ossola | The Verge</title>
	<subtitle type="text">The Verge is about technology and how it makes us feel. Founded in 2011, we offer our audience everything from breaking news to reviews to award-winning features and investigations, on our site, in video, and in podcasts.</subtitle>

	<updated>2016-02-17T15:46:49+00:00</updated>

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		<entry>
			
			<author>
				<name>Alexandra Ossola</name>
			</author>
			
			<title type="html"><![CDATA[A deadly fungus could lead to a lucrative black market in salamanders]]></title>
			<link rel="alternate" type="text/html" href="https://www.theverge.com/2016/2/17/11027432/salamander-trade-ban-bsal-fungus-black-market" />
			<id>https://www.theverge.com/2016/2/17/11027432/salamander-trade-ban-bsal-fungus-black-market</id>
			<updated>2016-02-17T10:46:49-05:00</updated>
			<published>2016-02-17T10:46:49-05:00</published>
			<category scheme="https://www.theverge.com" term="Report" /><category scheme="https://www.theverge.com" term="Science" />
							<summary type="html"><![CDATA[Last month, the US Fish and Wildlife Service banned the interstate and international trade of about 200 species of salamanders to protect them from a fungus &#8212; a move some experts fear will create a black market. The ban is intended to protect North American salamanders from a fungus called Batrachochytrium salamandrivorans, or Bsal, which [&#8230;]]]></summary>
			
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<img alt="" data-caption="" data-portal-copyright="&lt;a href=&quot;https://www.flickr.com/photos/2ndpeter/15862551686/&quot;&gt; Peter Paplanus&lt;/a&gt;" data-has-syndication-rights="1" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/13082553/15862551686_c27c7e8c6f_o.0.0.1455670405.jpg?quality=90&#038;strip=all&#038;crop=0,0,100,100" />
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<div class="m-snippet thin"> <p>Last month, the US Fish and Wildlife Service <a href="http://www.fws.gov/news/ShowNews.cfm?ref=service-lists-201-salamander-species-as-injurious-to-help-keep-lethal-&amp;_ID=35433">banned the interstate and international trade</a> of about 200 species of salamanders to protect them from a fungus &mdash; a move some experts fear will create a black market.</p> <p>The ban is intended to protect North American salamanders from a fungus called <em>Batrachochytrium salamandrivorans</em>, or Bsal, which has been wiping out salamander populations in Europe. The ruling prohibits the importation and interstate trade of 201 species of salamanders, dead or alive. Enforcement agents at domestic shipping centers, at airports, and at ports who intercept a salamander will have to check its species. If the species is banned, the officer could confiscate the amphibian; smugglers could be slapped with up to $5,000 in fines and six months in prison.</p> <p><q class="center">The US is a &#8220;hot spot&#8221; for the illegal salamander trade</q></p> <p>The illegal trade of endangered salamanders, especially the prettiest and most brightly colored species, has been going on for years &mdash; and the US is a &#8220;hot spot&#8221; for the illegal market, says Christina M. Meister, a spokeswoman from FWS. The ban will push many small-time vendors out of business since they will no longer be allowed to receive or ship salamanders across state lines &mdash; and may give some an incentive to join illegal trade. So many suppliers and buyers are still interested in the banned species that some traders believe that the illegal trade will grow astronomically.</p> <p>&#8220;Anything illegal doubles in value &mdash; all [FWS] is doing is creating a black market,&#8221; says Felton Willis, the owner of<a href="http://reptilecity.com/"> Reptile City Inc</a> in Honey Grove, Texas. &#8220;Sometime in the future, some kid will wake up and say, &lsquo;I want an eastern spotted newt,&rsquo; the parents will go searching online, and they&rsquo;ll have to tell their kids that buying [a salamander] is like buying a kilo of cocaine.&#8221;</p> <p>The species covered in the new ban join other animals smuggled for the exotic pet trade. For example, over the past five years, pet traders in Iran have been dipping into rivers in the Zagros Mountains to catch the Luristan newt, also known as the Kaiser&rsquo;s spotted newt, which <a href="http://www.backwaterreptiles.com/newts/iranian-kaiser-newt-for-sale.html">sells online</a> for $150. Experts now estimate that <a href="http://www.rferl.org/content/Iranian_Salamander_Gets_Protected_Status_Due_To_ECommerce_Threat/1995407.html">less than 1,000</a> are left in the wild.</p> </div><div class="m-snippet full-image"> <img data-chorus-asset-id="6051139" alt="Frosted-Flatwoods-Salamander-flickr" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/6051139/14660443782_82547344fe_o.0.jpg"><p><em><small>Frosted Flatwoods Salamander <a href="https://www.flickr.com/photos/usgeologicalsurvey/14660443782/">(USGS)</a></small></em></p> </div><!-- ######## END SNIPPET ######## --><div class="m-snippet thin"> <p>Then there&rsquo;s the <a href="http://www.amphibians.org/amazing-amphibians/the-laotian-newt/">Laotian Newt</a>. Immediately after it was discovered in 2002, pet traders started selling it illegally all over the world. Importers were even forging its paperwork, says Joseph Mendelson, a biologist at the Georgia Institute of Technology.</p> <p>Because Bsal poses such a threat to native salamander populations, conservationists and ecologists have been pushing for a ban for years. But for mild-mannered amphibian retailers who don&rsquo;t want to break the law, there&rsquo;s a very tangible economic impact. While amphibians make up a tiny portion of the estimated <a href="http://www.americanpetproducts.org/press_industrytrends.asp">$60.6 billion</a> Americans spent on their pets in 2015, FWS acknowledges that the ban will lead to an estimated $3.9 million in lost sales from pet vendors. The losses will be felt most acutely by hobbyists and small-time vendors that only trade domestic species; FWS estimates that about $2.3 million in losses, about 60 percent of the overall estimate, will come from small businesses alone. And factoring in indirect losses &mdash; for instance, people buying habitat items for their salamanders &mdash; the total cost to pet stores will be about $10.7 million, <a href="http://www.fws.gov/injuriouswildlife/pdf_files/Econ-RFA-Draft_12-28-15.pdf">the report says</a>.</p> <p><q class="center">the ban will lead to an estimated $3.9 million in lost sales</q></p> <p> </p> <aside class="float-right"> <img data-chorus-asset-id="6058201" alt="green-marbled-newts-michael-shrom" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/6058201/tmarmo.0.jpeg"><p><em><small>Green marbled newts (Michael Shrom)</small></em></p></aside> While distributors generally agree that limiting the import of salamanders is necessary to protect the amphibians, the ban on interstate shipping is what will hurt the small vendors the most, they say. That ban is essentially meant to prevent the spread of Bsal if it arrives in the US, according to FWS. Distributors don&rsquo;t see it that way. They sell salamanders caught wild in nearly every state in the country along with hundreds of thousands bred in captivity, shipping them to individual pet owners or mom-and-pop pet stores in other states. If these small distributors disappear, people who would supply those companies would feel the loss of income, too. With thousands of salamanders at their disposal, some might look to sell the amphibians illegally, sending them across state lines themselves.<p> </p> <p>&#8220;For companies like ours, processing 500&ndash;600 orders per week, 95 percent of our business is done across state lines,&#8221; Willis says. &#8220;That ban will take a big cut out of our revenue.&#8221; Peter Lembcke, a science educator who breeds salamanders in kiddie pools in his backyard, says that the ban is going to stop him from selling the few hundred salamanders he ships per year &mdash; which means he&rsquo;ll lose a fifth of his income. He used to make most of his sales online, he says, but finding buyers that way will be nearly impossible since he&rsquo;s restricted to selling salamanders within South Carolina, where he lives.</p> <p> </p> <aside class="float-left"> <img data-chorus-asset-id="6058255" alt="zero-g-newts-shrom" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/6058255/newts_in_zero_g.0.gif"><p><em><small>Newts in microgravity (Michael Shrom)</small></em></p></aside> <br id="1455682701426"> Michael Shrom, a machinist who provides salamanders to NASA and other research institutions experimenting with limb regrowth, says that the ban on interstate trade is going to drastically hinder research. While scientists can receive permits to ship or receive banned species of salamanders, Shrom says he will no longer have enough economic incentive to keep breeding them.<p>Whenever something is banned, there&rsquo;s always the risk that customers will find other ways to get the product illegally. &#8220;[Salamander smuggling] is a concern. I have no idea if that&rsquo;ll happen, but I imagine that it could,&#8221; says <a href="http://csmbio.csm.jmu.edu/biology/harrisrn/site/Home.html">Reid Harris</a>, a biology professor at James Madison University.</p> <p>In the past, when the FWS has listed a species as injurious to native wildlife, online distributors linking buyers and sellers of those species have disappeared. David Hoskins, the assistant director of the FWS Fish and Aquatic Conservation Program, says that FWS doesn&rsquo;t believe an illegal salamander trade is imminent &mdash; hundreds of species aren&rsquo;t known to transmit Bsal, so they can still be traded, and Hoskins hopes that customers will simply purchase one of those species if they don&rsquo;t want pet salamanders native to their home states.</p> <p>James Lewis, the director of operations at the conservation nonprofit Amphibian Survival Alliance, believes that illegal trade won&rsquo;t be much of an issue because the people who supply that industry know the risks of trading them illegally. &#8220;The vast majority of salamander owners are passionate about their hobby and supportive of conservation. They understand the need to protect wild salamanders, and I think very few will be interested or support an illegal trade,&#8221; he says.</p> </div><div class="m-snippet full-image"> <img data-chorus-asset-id="6051149" alt="cheat-mountain-salamander-flickr" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/6051149/13432757184_2dff59209d_o.0.jpg"><p><em><small>Cheat Mountain Salamander (<a href="https://www.flickr.com/photos/usfwsnortheast/13432757184/">US FWS</a>)</small></em></p> </div><!-- ######## END SNIPPET ######## --><div class="m-snippet thin"> <p>The vendors themselves, however, are less convinced. &#8220;Oh, the black market is going to be huge,&#8221; Willis says. &#8220;A customer asked me if this ban is going to stop anything. I said, &lsquo;No, now you&rsquo;re just going to pay $30 to $40 for a salamander that someone got out of the creek.&rsquo;&#8221;</p> <p>Lembcke, the kiddie-pool breeder, agrees that a black market is inevitable, though he&rsquo;s not sure it&rsquo;ll be quite so big. Customers who have heard about the ban are buying up salamanders much more quickly than usual &mdash; Lembcke says he&rsquo;s sold more salamanders in the two weeks before the ban went into effect than he typically would have in several months.</p> <p><q class="center">&#8220;A customer asked me if this ban is going to stop anything. No, you&#8217;re just going to pay $30 to $40 for a salamander that someone got out of the creek.&#8221;</q></p> <p>Lewis, of the conservation nonprofit, sees an additional risk in importing the species that were rarely traded before the ban. Now these non-prohibited species will be some of the few salamanders still freely sold as pets. Many of them are hard to breed in captivity, he says, so the salamander pet trade might see an uptick in wild-caught salamanders. That could reduce the numbers still found in the wild.</p> <p>The ban looks like it will be here to stay; Hoskins says the feedback on the initial ruling has been largely positive. But Harris says that the ban didn&rsquo;t go far enough &mdash; it didn&rsquo;t restrict one species of newt (newts are a type of salamander) that might be a carrier of Bsal but simply hasn&rsquo;t been tested yet. Even if the ban were airtight, experts know better than to think it can keep Bsal out forever. But it might delay the fungus&rsquo;s arrival just long enough to develop strategies to quarantine and treat infected salamanders. After that point, the salamander trade might be able to resume again, though there&rsquo;s currently no &#8220;sunset clause&#8221; in the ban that might allow it to someday become defunct.</p> <p>The ban went into effect on January 28th, but the comment period is open until mid-March. In that time, scientists and vendors will try to voice their concerns to make the ruling more or less restrictive accordingly. To the distributors, customers are the ones that suffer; it will now be much harder for young kids geeked out on science to indulge their curiosity by owning a pet salamander. &#8220;Lots of people get into science because enjoy learning about the animals. And this ban is going to make it more difficult for people to interact with these animals because they won&rsquo;t find them the pet stores they know,&#8221; Lembcke says. For proponents of the ban, that&rsquo;s a small price to pay to save North America&rsquo;s diverse salamander populations &mdash; without the arrival of Bsal, kids can still go out to backyard streams and catch their own salamanders.</p> </div><!-- ######## END SNIPPET ######## -->
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			<author>
				<name>Alexandra Ossola</name>
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			<title type="html"><![CDATA[Water alone couldn&#8217;t have made Mars hospitable to life]]></title>
			<link rel="alternate" type="text/html" href="https://www.theverge.com/2014/12/11/7376841/what-might-have-made-mars-hospitable-to-life" />
			<id>https://www.theverge.com/2014/12/11/7376841/what-might-have-made-mars-hospitable-to-life</id>
			<updated>2014-12-11T14:00:02-05:00</updated>
			<published>2014-12-11T14:00:02-05:00</published>
			<category scheme="https://www.theverge.com" term="Report" /><category scheme="https://www.theverge.com" term="Science" />
							<summary type="html"><![CDATA[Dried-up riverbeds, water-weathered minerals, underground reservoirs of ice: the evidence for Mars&#8217; watery past keeps building. In fact, the eight missions that have successfully landed on the red planet have been mostly focused on finding hints of Mars&#8217; watery past because it&#8217;s considered a strong indication that the planet may have hosted life before it [&#8230;]]]></summary>
			
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<img alt="" data-caption="Curiosity at the &#039;Windjana&#039; Drilling Site | &lt;a href=&quot;http://www.nasa.gov/jpl/msl/pia18390/&quot;&gt;NASA/JPL-Caltech/MSSS&lt;/a&gt;" data-portal-copyright="&lt;a href=&quot;http://www.nasa.gov/jpl/msl/pia18390/&quot;&gt;NASA/JPL-Caltech/MSSS&lt;/a&gt;" data-has-syndication-rights="1" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/15099860/pia18390-full.0.0.1418316416.jpg?quality=90&#038;strip=all&#038;crop=0,0,100,100" />
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	Curiosity at the 'Windjana' Drilling Site | <a href="http://www.nasa.gov/jpl/msl/pia18390/">NASA/JPL-Caltech/MSSS</a>	</figcaption>
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<p>Dried-up riverbeds, water-weathered minerals, underground reservoirs of ice: the evidence for Mars&rsquo; watery past keeps building. In fact, the <a href="http://mars.nasa.gov/programmissions/missions/log/">eight missions</a> that have successfully landed on the red planet have been mostly focused on finding hints of Mars&rsquo; watery past because it&rsquo;s considered a<a href="http://www.nytimes.com/2014/12/09/science/-stronger-signs-of-life-on-mars.html"> strong indication</a> that the planet may have hosted life before it became the cold, barren planet we know today.</p>

<p>But water is just one of several factors that would support the evolution of life. Other necessary physical and chemical characteristics, like temperature and radiation levels, might be more difficult to find in the rock record because the nature of these conditions means they are not as well-preserved, says <a href="http://www.planetary.org/connect/our-experts/profiles/pamela-conrad.html">Pamela Conrad</a>, an astrobiologist with NASA&rsquo;s Planetary Environments Laboratory in Greenbelt, Maryland.</p>
<p><q class="right">water is just one of several factors that support the evolution of life</q>Conrad reminds researchers of the physical and chemical characteristics required for life that may be more complicated to find in the rock record, in a <a href="http://www.sciencemag.org/lookup/doi/10.1126/science.1259943">paper</a> published today in <em>Science</em>. She hopes to remind researchers to look for more of these factors in determining Mars&rsquo; past habitability.</p>
<p>&#8220;People have often focused on the water, and there&rsquo;s a lot more going on with Mars,&#8221; says<a href="http://www.astro.washington.edu/users/rory/"> Rory Barnes</a>, an astrobiologist at the University of Washington in Seattle who was not involved in this study. &#8220;Conrad&rsquo;s paper provides a sort of sanity check on what we&rsquo;re trying to do on Mars and what we still need to find out. It&rsquo;s a complicated web of issues that affect planetary habitability.&#8221;</p>
<p><q class="left">&#8220;a sort of sanity check.&#8221;</q>Scientists are pretty sure of the<a href="http://www.pbs.org/wgbh/nova/evolution/how-did-life-begin.html"> conditions</a> they&rsquo;re looking for that would have supported the evolution of life: a source of energy (often the sun), air to breathe, and water. Researchers looking for when organisms might have lived on Mars look to the layers of rock and soil that preserved records of physical conditions when the rock was deposited. But finding evidence that these conditions occurred at the right time is more complicated than it seems.</p>
<p>One of the physical factors Conrad points to is temperature variation; today, even near the equator where temperatures are more stable, a Martian day can be about 70 degrees Fahrenheit but drop to negative 100 degrees at night. Even if other factors for bacterial life like the right nutrients and water were present, the extreme temperatures would make survival challenging for early life. Although Barnes points out that these daily temperature changes would be more drastic if a Martian day lasted longer, it&rsquo;s probably still too cold for life to thrive.</p>
<img src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/2541008/pia18393-main_sol3663b_pillinger_point_l257atc.0.jpg?quality=90&#038;strip=all&#038;crop=0,0,100,100" alt="" title="" data-has-syndication-rights="1" data-caption="" data-portal-copyright="" /><p><em>A panoramic view of Pillinger Point, from Endeavor Crater, as seen by Mars rover Opportunity <a href="http://www.nasa.gov/jpl/mer/pia18393/" target="new">(NASA/JPL-Caltech/Cornell Univ./Arizona State Univ.)</a></em></p>
<p>Radiation is another important factor. Mars&rsquo; thin atmosphere doesn&rsquo;t do a good job of protecting its surface from the sun&rsquo;s damaging rays. &#8220;If you have too much radiation, it overwhelms the repair mechanisms that we have in our DNA,&#8221; Conrad said. With high radiation, life would be unlikely to survive.</p>

<p>Wind can also affect burgeoning life forms because of how it deposits iron. Simple and complex organisms need iron for many<a href="http://www.highveld.com/microbiology/iron-metabolism.html"> biological processes</a>, such as making DNA and transporting oxygen and carbon dioxide within the body. Most primitive organisms aren&rsquo;t very mobile, so they would need to grow in a place where the wind consistently deposits iron for them to use.</p>

<p>These necessary characteristics are affected by Mars&rsquo; thin atmosphere. Around 4 billion years ago, a barrage of broken-up asteroids and comets slammed into the early solar system in an event called the<a href="http://www.bbc.co.uk/science/earth/earth_timeline/late_heavy_bombardment"> Late Heavy Bombardment</a>. Because Mars is so small (it has only <a href="http://nssdc.gsfc.nasa.gov/planetary/factsheet/marsfact.html">11 percent</a> of Earth&rsquo;s mass), its gravity isn&rsquo;t as strong; scientists think that so many objects hit the planet that most of its atmosphere was <a href="http://science.time.com/2013/07/23/revealed-how-mars-lost-its-atmosphere/">blasted away</a>. &#8220;On Mars, it would be really important to understand if the planet maintained its atmosphere when it was warm and wet,&#8221; Conrad says, because those conditions together may have been the best chance for life to occur.</p>
<p><q class="right">the evidence is limited</q>But all of these conditions aren&rsquo;t preserved very well in the rocks scientists use to study Mars&rsquo; past. The evidence is limited to isotopes, variations of the same element, that could indicate what the past atmosphere, radiation, and sometimes even temperature would have been like. This limited record can be affected by conditions that happen after it&rsquo;s been preserved, Conrad says, which makes the results much more difficult to interpret.</p>
<p>Although the rovers have answered a lot of scientists&rsquo; questions about Mars, they can&rsquo;t synthesize information the way humans can. &#8220;You can get a broader context by having humans present &mdash; one can respond in real time and one can look underneath and behind rocks that appear to have morphological and chemical clues about the evolution of the Martian surface,&#8221; Conrad said. Both Conrad and Barnes have high hopes for what humans will be able to discover in NASA&rsquo;s rumored<a href="http://www.space.com/24268-manned-mars-mission-nasa-feasibility.html"> crewed mission</a> to Mars, possibly in 2030.</p>
<p><q class="left">Mars is the closest planet that&#8217;s relatively hospitable for humans</q>We&rsquo;ve spent a lot of money learning about Mars, but scientists still have a lot of questions. More missions sent there could help answer them. Even though the environment on Mars isn&rsquo;t exactly comfortable, it&rsquo;s probably the closest planet that is relatively hospitable for humans; our other neighbor, Venus, has surface temperatures <a href="http://wiredcosmos.com/2012/12/13/venus-our-solar-systems-version-of-hell/">hot enough to melt lead</a> and wind speeds twice as fast as our most intense hurricanes. &#8220;We should keep going back to Mars because it&rsquo;s where can we best go to school to learn how to explore other planets,&#8221; she says.</p>
<p>There&rsquo;s still a remote chance that we&rsquo;ll find life preserved in the Martian rock record, Conrad says. The bacteria would have to be abundant enough for us to find it, preserved well at the time, not destroyed by radiation in the aeons since they were fossilized, and we would need the right tools to know what we were looking at. But even if they don&rsquo;t find life, Conrad believes that the missions to Mars have been worthwhile because of how much scientists have learned about the conditions that may or may not support life.</p>

<p>&#8220;If we can find life that originated on another planet, that will do an enormous amount for us to understand the origins of life on Earth,&#8221; Barnes says. And by understanding how life started both here and on Mars, Conrad says, we can get a better sense for where to look elsewhere.</p>
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			<author>
				<name>Alexandra Ossola</name>
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			<title type="html"><![CDATA[Earth&#8217;s water probably didn&#8217;t come from comets, Rosetta scientists say]]></title>
			<link rel="alternate" type="text/html" href="https://www.theverge.com/2014/12/10/7371663/earths-water-probably-didnt-come-from-comets-rosetta-scientists-say" />
			<id>https://www.theverge.com/2014/12/10/7371663/earths-water-probably-didnt-come-from-comets-rosetta-scientists-say</id>
			<updated>2014-12-10T14:00:21-05:00</updated>
			<published>2014-12-10T14:00:21-05:00</published>
			<category scheme="https://www.theverge.com" term="Report" /><category scheme="https://www.theverge.com" term="Science" />
							<summary type="html"><![CDATA[The researchers behind Rosetta, the ESA spacecraft currently orbiting the Churyumov-Gerasimenko comet, think they can help answer one of the fundamental questions about how water came to Earth: most likely not from comets. They published their findings today in Science. Around 4 billion years ago, meteorites repeatedly slammed into the young Earth in a violent [&#8230;]]]></summary>
			
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<img alt="" data-caption="" data-portal-copyright="&lt;a href=&quot;www.esa.int/spaceinimages/Images/2014/11/Welcome_to_a_comet&quot;&gt;European Space Agency&lt;/a&gt;" data-has-syndication-rights="1" src="https://platform.theverge.com/wp-content/uploads/sites/2/chorus/uploads/chorus_asset/file/15098657/Welcome_to_a_comet.0.0.1418236661.jpg?quality=90&#038;strip=all&#038;crop=0,0,100,100" />
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<p>The researchers behind Rosetta, <a href="http://www.theverge.com/2014/11/12/7211867/a-tenuous-path-to-a-comet-the-rosetta-mission-in-photos">the ESA spacecraft currently orbiting the Churyumov-Gerasimenko comet</a>, think they can help answer one of the fundamental questions about how water came to Earth: most likely not from comets. They published <a href="http://www.sciencemag.org/lookup/doi/10.1126/science.1261952">their findings</a> today in <em>Science</em>.</p>

<p>Around 4 billion years ago, meteorites repeatedly slammed into the young Earth in a violent event called the Late Heavy Bombardment. This happened right after our planet&rsquo;s crust had started to cool, so instead of burning up and disintegrating into the molten surface of an older Earth, these chunks of comets and asteroids made landfall. In the process they likely brought the first organic molecules to Earth and maybe even enough <a href="http://earthsky.org/space/did-comets-bring-water-to-earth">water</a> to form oceans, setting the scene for life to take hold.</p>

<p>Since the average asteroid and comet are much older than most of Earth&rsquo;s crust today by several billion years, scientists have been chasing them down to better understand the conditions under which life on Earth may have started. In the eight analyses of comets that scientists have done so far, water has been a central question; instruments both near and far to the comet can detect the concentrations of certain elements in comet ice to see if they match what we see on Earth. But with data from only a few comets, not all planetary scientists are convinced that the answer is quite so simple.</p>

<p>Although the Rosetta orbiter is not the first to do close analysis of ice on a comet, <a href="http://spaceresearch.scnatweb.ch/members/altwegg.html">Kathrin Altwegg</a>, the principal investigator of the mass spectrometer on the Rosetta craft, an astronomer at the University of Bern in Switzerland and one of the study authors, says this data is a surprising addition to the information we already know. &#8220;When we launched this mission 10 years ago, I wouldn&rsquo;t have been surprised at all about the findings,&#8221; she says. But then, three years ago, a mission to the comet Hartley&ndash;2 three years ago yielded very different results &mdash; suggesting that Earth&rsquo;s water may have been deposited by comets. Rosetta&rsquo;s findings don&rsquo;t support that conclusion. &#8220;Not everything is as simple as it seems &mdash; we have real science here,&#8221; she says.</p>

<p>The scientists are addressing the dispute about water&rsquo;s origin by looking at hydrogen isotopes, molecules that all have the same number of protons and electrons but different numbers of neutrons in their nuclei. They&rsquo;re still hydrogen &mdash; but one isotope dubbed deuterium has one more neutron, which means it&rsquo;s heavier than regular hydrogen. Both hydrogen and deuterium are found in water and ice. The unique ratio of hydrogen to deuterium can help identify where in the solar system the water came from. The Earth has a pretty small ratio, only three heavy molecules out of 10,000, Altwegg says, but it&rsquo;s a ratio that is characteristic of our planet. Because Rosetta was so close to the comet, scientists were able to use a technique called mass spectrometry to determine the quantity and type of chemicals present in a sample. It&#8217;s also possible to detect the ratio in comets that are farther away; to do so, scientists have used remote observations based on the light waves coming from the sample.</p>

<p>In the 30 years that astronomers have been looking at this ratio of deuterium to hydrogen in comets, they&rsquo;ve seen a range of ratios, which means individual comets formed under very different conditions. The first three comets that researchers analyzed had ratios double those found on Earth, says <a href="http://humbertocampins.com/">Humberto Campins</a>, a physics and astronomy professor at the University of Central Florida in Orlando. Another two have the same ratios as on Earth. But on the Churyumov-Gerasimenko comet that Rosetta is orbiting, the ratio is even higher, with deuterium molecules present at three times the concentration that they appear on Earth.</p>

<p>The ratio on Churyumov-Gerasimenko is so different from other observations that comets like it couldn&rsquo;t have been responsible for bringing water to Earth, Altwegg says. &#8220;Terrestrial water was more likely brought by asteroids than comets,&#8221; Altwegg says. Although asteroids are now much rockier than comets, they probably used to have more ice with ratios that were closer to those that we see on Earth, she suggests.</p>

<p>But Florida&rsquo;s Campins isn&rsquo;t ready to draw any conclusions. &#8220;Rosetta&rsquo;s findings are interesting and important, but I wouldn&rsquo;t necessarily say that this information makes asteroids a more likely source,&#8221; he said. The small amount of data that scientists have from comets in this part of the solar system aren&rsquo;t enough to draw any definite conclusions, especially given the variation in readings they&rsquo;ve already found, Campins said. Also, no one is really sure what can affect the ratio of deuterium to hydrogen. What&rsquo;s more, we&rsquo;re not even sure if our ratio for Earth is right &mdash; getting readings from <a href="http://www.astrobio.net/news-exclusive/scientists-detect-evidence-oceans-worth-water-earths-mantle/">water in Earth&rsquo;s lower layers</a>, which scientists don&rsquo;t yet have, might change the ratio. &#8220;When you look at this data carefully, the conclusion isn&rsquo;t so black and white, but it&rsquo;s still an interesting result,&#8221; Campins said.</p>

<p>Both Campins and Altwegg agreed that they need more research on comets and asteroids to understand how water came to be on Earth. Altwegg mentioned that Japan&rsquo;s prospective <a href="http://www.jspec.jaxa.jp/e/activity/hayabusa2.html">Hayabusa-2</a> mission, intended to collect a sample from a nearby asteroid and bring it back to Earth, will likely provide more data. &#8220;If Hayabusa-2 brings a sample home, that&rsquo;s always the best thing,&#8221; Altwegg said. That&rsquo;s because the tests here on Earth are more sensitive than what can be done in space, Altwegg said.</p>

<p>But Campins has more questions. He is working on NASA&rsquo;s <a href="http://science.nasa.gov/missions/osiris-rex/">OSIRIS-REx</a> mission, set to launch in 2016, which has a similar goal of bringing back a sample from a nearby asteroid to understand not only the water it may have contained, but also the organic molecules that might have helped start life on Earth. &#8220;By understanding how life came to Earth, we might understand how we may find life elsewhere,&#8221; Campins said.</p>
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