posted on Aug, 11 2009 @ 09:16 AM
Considering everything already shown here, I believe this is almost the confirmation of the obvious... forget the little green men (although other
evidences already convinced me they actually exist(ed) ).
This is from the best scientific journal we currently have "Nature":
Observed variations of methane on Mars unexplained by known atmospheric chemistry and physics
The detection of methane on Mars has revived the possibility of past or extant life on this planet, despite the fact that an abiogenic origin is
thought to be equally plausible. An intriguing aspect of the recent observations of methane on Mars is that methane concentrations appear to be
locally enhanced and change with the seasons. However, methane has a photochemical lifetime of several centuries, and is therefore expected to have a
spatially uniform distribution on the planet. Here we use a global climate model of Mars with coupled chemistry to examine the implications of the
recently observed variations of Martian methane for our understanding of the chemistry of methane. We find that photochemistry as currently understood
does not produce measurable variations in methane concentrations, even in the case of a current, local and episodic methane release. In contrast, we
find that the condensation–sublimation cycle of Mars' carbon dioxide atmosphere can generate large-scale methane variations differing from those
observed. In order to reproduce local methane enhancements similar to those recently reported, we show that an atmospheric lifetime of less than 200
days is necessary, even if a local source of methane is only active around the time of the observation itself. This implies an unidentified methane
loss process that is 600 times faster than predicted by standard photochemistry. The existence of such a fast loss in the Martian atmosphere is
difficult to reconcile with the observed distribution of other trace gas species. In the case of a destruction mechanism only active at the surface of
Mars, destruction of methane must occur with an even shorter timescale of the order of approx 1 hour to explain the observations. If recent
observations of spatial and temporal variations of methane are confirmed, this would suggest an extraordinarily harsh environment for the survival of
organics on the planet.
For those of you who are actually interested on the subject, do spend the time to read the complete article. Despite the fact it is rather
conservative in terms of being ready to assume there's life on Mars they actually proved it, plain and simple.
[edit on 02/11/2008 by novrod]