The "Great Filter" is a hypothetical barrier to explain why civilisations are so unlikely to progress to the point of inter-stellar colonisation that we have not encountered any in 40 years of looking. Maybe humanity has already negotiated the filter - as some massive evolutionary improbability - or perhaps it lies in our future as an almost-certain threat to our existence? We should hold our breath as we look for evidence of life on Mars.
posted on May 12, 2008 - View this thread

Real robot drama is happening on Mars today. Spirit, racing for her life to find shelter before winter, injured and underpowered after four years of hard labor, may have made her most significant find yet. The broken foot she's dragged behind her for the past two years unexpectedly uncovered evidence of a once-wet Mars with conditions theoretically hospitable for primitive life.
posted on Dec 12, 2007 - View this thread

ESA scientists announced that a giant sea is hidden under the Martian surface. With discoveries like this and weird photos like this, how long can it be before we find conclusive proof of extraterrestrial life?
posted on Feb 21, 2005 - View this thread

Life - a strong case for life on mars was presented sunday
posted on Feb 17, 2005 - View this thread

A pair of NASA scientists told a group of space officials at a private meeting here that they have found strong evidence that life may exist today on Mars. Spirit has also recently taken a very intriguing photo. Of course this is just making things official, since we've known the truth for years.
posted on Feb 16, 2005 - View this thread