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The Cassini spacecraft detected warmth, water and organic
chemicals, the basic ingredients for life on Saturn’s small moon, Enceladus, reinforcing
scientists’ belief that our solar system has favorable conditions appropriate
for living organisms to develop.
At a briefing at NASA headquarters in Washington on Wednesday, the scientists
described observations made by the Cassini spacecraft when it flew at approximately
30 miles over the surface of Enceladus on March 12, with an astounding 15
kilometers per second speed as part of ongoing exploration of Saturn and its
moons.
The spacecraft discovered a high density of water vapor and
both simple and complex organic chemicals, as well as high temperatures which together
could provide most of the prerequisites for life.
“Water vapor was the major constituent. There was methane
present. There was carbon dioxide. There was carbon monoxide. There were simple
organics and there were more complex organics. The composition of the plume is
very much like the composition of a comet,” Hunter Waite of the Southwest
Research Institute in San Antonio, Texas, said at the briefing, according to
Reuters.
Comets are believed to contain primordial materials leading
many scientists think the objects might have seeded life on Earth.
Where did the organics come from? “Or course, natural gas
comes from decaying biological matter on Earth. But this is not the conclusion
we reached for Enceladus. Another possibility is the geochemistry going on in
the interior can also produce organics,” Waite explained.
Scientists also said that detailed heat maps of the lunar
surface revealed the south pole is warmer than previously thought, although
still frigid at minus -135 degrees Fahrenheit (-93 degrees C).
The fact that heat is escaping through the tiger stripes
suggests that it’s even warmer under the moon’s surface. “They’re still awfully
cold, but much warmer than background temperatures of the rest of the surface.
This means it has to be even warmer under the surface and raises the
possibility of liquid water beneath the [exterior],” Cassini co-investigator
John Spencer of the Southwest Research Institute in Boulder, Colorado,
said.
In conclusion, what Cassini found suggested Enceladus had
significant astrobiological potential – potential for life – Waite said. “The
organics are clearly in the abundance beyond that we expected.”
The Enceladus report comes just days after scientists said
in a paper that Cassini had supplied evidence for the possible existence of a
subsurface of water and ammonia on Titan, Saturn’s largest moon.
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