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On Earth methane is produced in large quantities both by microbes and the digestive processes of large animals such as cows.
The gas has a short lifetime of just a few hundred years on Mars because it is continuously being destroyed by sunlight in the planet's atmosphere.
Yet its levels remain constant, leading scientists to speculate about what might be topping it up.
Some experts believe the most likely source is extraterrestrial micro-organisms living in the Martian soil.
Their hopes have now been raised by the latest research, which has dismissed one of the leading alternative theories.
Spirit, the Mars rover with one wheel stuck fast in the planet's soft sand since April, has uncovered some of the best evidence yet that water once existed on the planet, apparently after a time of intense volcanic activity billions of years ago.
The evidence came from sand the rover dug up as its stuck wheel spun, broke through a thin rocky crust and created a tiny crater about 5 feet wide and less than 10 inches deep
Macaulayite is a fine grain mineral containing water bound to the inner surfaces, so if its presence is confirmed on Mars, this would mean water must also have been present, and therefore the planet may have been able to sustain life.
The surface of Mars is littered with channels that appear to be the work of ancient water flows. Indeed, some of these channels meander back and forth like slow-moving streams on our planet. Channels can be carved by lava, wind and glaciers, but these processes can't explain all the features on Mars.
In 1996, NASA researchers reported that a meteorite contained evidence that life once existed on Mars. But others argued that the evidence was most likely caused by inorganic processes that could be recreated artificially. A second group of NASA researchers (containing some scientists from the first study) has reexamined the 1996 findings using a new analysis technique called ion beam milling, and they again claim that living organisms are most likely responsible for the materials found in the meteorite
Originally posted by MysterE
reply to post by Majestic RNA
It reminds me of the water on the moon revelation, when studies started to come out then all of the sudden, we had water on the moon!
-E-
Originally posted by MysterE
reply to post by georgejetson
But just in the last 8 days we have very different methods drawing the came conclusions, it is either a coincidence, or something else.
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