Carbon dioxide cold traps on the moon are confirmed for the first time
The traps likely contain solid carbon dioxide that could be used to
sustain robot or human presence on the moon

Date:
November 15, 2021
Source:
American Geophysical Union
Summary:
After decades of uncertainty, researchers have confirmed the
existence of lunar carbon dioxide cold traps that could potentially
contain solid carbon dioxide. The discovery will likely have a
major influence in shaping future lunar missions and could impact
the feasibility of a sustained robot or human presence on the moon.



FULL STORY ========================================================================== After decades of uncertainty, researchers have confirmed the existence
of lunar carbon dioxide cold traps that could potentially contain solid
carbon dioxide.

The discovery will likely have a major influence in shaping future lunar missions and could impact the feasibility of a sustained robot or human presence on the moon.


==========================================================================
In the permanently shadowed regions at the poles of our moon, temperatures
dip below those in the coldest areas of Pluto, allowing for carbon dioxide
cold traps. In these cold traps, carbon dioxide molecules could freeze and remain in solid form even during peak temperatures in the lunar summer.

Future human or robot explorers could use the solid carbon dioxide in
these cold traps to produce fuel or materials for longer lunar stays. The carbon dioxide and other potential volatile organics could also help
scientists better understand the origin of water and other elements on
the moon.

Although cold traps have been predicted by planetary scientists for years,
this new study is the first to firmly establish and map the presence
of carbon dioxide cold traps. To find the coldest spots on the moon's
surface, researchers analyzed 11 years of temperature data from the
Diviner Lunar Radiometer Experiment, an instrument flying aboard NASA's
Lunar Reconnaissance Orbiter.

The new research, published in the AGU journal Geophysical Research
Letters, which publishes high-impact, short-format reports with immediate implications spanning all Earth and space sciences, shows that these cold
traps include several pockets concentrated around the lunar southern
pole. The total area of these carbon dioxide traps totals 204 square kilometers, with the largest area in the Amundsen Crater hosting 82
square kilometers of traps. In these areas, temperatures continually
remain below 60 degrees Kelvin (about minus 352 degrees Fahrenheit.)
The existence of carbon dioxide cold traps does not guarantee the
existence of solid carbon dioxide on the moon, but this verification
does make it highly likely that future missions could find carbon dioxide
ice there, according to the researchers.



==========================================================================
"I think when I started this, the question was, 'Can we confidently say
there are carbon dioxide cold traps on the moon or not?'" said Norbert Scho"rghofer, a planetary scientist at the Planetary Science Institute
and lead author on the study. "My surprise was that they're actually, definitely there. It could have been that we can't establish their
existence, [they might have been] one pixel on a map... so I think
the surprise was that we really found contiguous regions which are cold
enough, beyond doubt." Managing the moon The existence of carbon dioxide
traps on the moon will likely have implications for the planning of
future lunar exploration and international policy regarding the resource.

If there is indeed solid carbon dioxide in these cold traps, it could potentially be used in a variety of ways. Future space explorers could
use the resource in the production of steel as well as rocket fuel and biomaterials, which would both be essential for sustained robot or human presence on the moon. This potential has already attracted interest from governments and private companies.

Scientists could also study lunar carbon to understand how organic
compounds form and what kind of molecules can be naturally produced in
these harsh environments.

The carbon dioxide cold traps could also help scientists answer
long-standing questions about the origins of water and other volatiles
in the Earth-moon system, according to Paul Hayne, a planetary scientist
at the University of Colorado, Boulder who was not involved in the study.

Carbon dioxide could be a tracer for the sources of water and other
volatiles on the lunar surface, helping scientists to understand how
they arrived on the moon and on Earth.

"These should be high-priority sites to target for future landed
missions," Hayne said. "This sort of pinpoints where you might go on
the lunar surface to answer some of these big questions about volatiles
on the moon and their delivery from elsewhere in the solar system." ========================================================================== Story Source: Materials provided by American_Geophysical_Union. Note:
Content may be edited for style and length.


========================================================================== Journal Reference:
1. Norbert Schorghofer, Jean‐Pierre Williams, Jose
Martinez‐Camacho, David A. Paige, Matthew A. Siegler. Carbon
Dioxide Cold Traps on the Moon. Geophysical Research Letters,
2021; 48 (20) DOI: 10.1029/2021GL095533 ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2021/11/211115151010.htm

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