What the European Space Agency Satalie 'Mars Express' (not NASA) foudn was two things:

1) Traces of Water-Ice mixed with large deposits of frozen Carbon Dioxide after scanning the Poles on Mars. While it is theoretically possible micro organism might still exist in the ice, we're talking about the lowest possible level of life.

2) The photographs they have taken close up of valleys and canyons on mars show signs of having being eroded by water at some point in the past. Therefore, larger organism may have existed in the oceans and rivers that once covered parts of mars. There may even have being some low level funguses that made it out of the water and onto the rocks. However, Mars really never had the necessary atmosphere required for life to evolve like the earth has had.

Although large asteroids (smaller asteroids hit planets all the time) like those that caused periods of extinction on earth may have hit mars in the past, most if not all life that may once have existed on mars probably died off as the sun cooled down dropping the surface temperature below freezing.

Still, if evidence of life is found on mars it is a huge scientific breakthrough because it increases the probability of life everywhere else in the universe.

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