Difference between revisions 813268024 and 814757780 on enwiki

{{AFC submission|d|essay|u=Robertinventor|ns=118|decliner=Tokyogirl79|declinets=20150702083850|ts=20150609204825}} <!-- Do not remove this line! -->

{{AFC comment|1=Fix reference errors. [[User:Robert McClenon|Robert McClenon]] ([[User talk:Robert McClenon|talk]]) 02:52, 21 April 2016 (UTC)}}

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Volume 231, 1 March 2014, Pages 51–64</ref>

Though there is little by way of water vapour in the Mars atmosphere, which is also a near vacuum - still it reaches 100% humidity at night due to the low nighttime temperatures. This effect creates the Martian morning frosts, which were observed by Viking in the extremely dry equatorial regions of Mars.

[[File:Ice on Mars Utopia Planitia (PIA00571).jpg|frame|center|600 px|
Aalt=Ice on Mars Utopia Planitia    |Ice on Mars Utopia Planitia. These frosts formed every morning for about 100 days a year at the Viking location. Scientists believe dust particles in the atmosphere pick up bits of solid water. That combination is not heavy enough to settle to the ground. But carbon dioxide, which makes up 95 percent of the Martian atmosphere, freezes and adheres to the particles and they become heavy enough to sink. Warmed by the Sun, the surface evaporates the carbon dioxide and returns it to the atmosphere, leaving behi(contracted; show full)==See also==
* [[Life on Mars]]

==References==
{{reflist}}

==External links==
* Three days long conference on the subject in 2013 [http://planets.ucla.edu/meetings/past-meetings/mars-habitability-2013/program/ The Present-Day Habitability of Mars 2013] under the auspices of the UCLA Institute for Planets and Exoplanets - with video archived for all the talks.