Mars once had an atmosphere a little like our own meaning that water could exist in liquid form (there have been dead rivers and ice found - they say). Liquid water is essential for the biological process of building up proteins from amino acids (think of it as the 'cement' of the bricks of life - water is the cement and the proteins are the bricks).
The atmosphere on Mars was caused in the same way as Earth - a magnetic field from the north and south poles protects us from The Sun's scorching solar wind. This field is caused by the spinning molten core inside Earth (the core is molten as it is still cooling from when The Earth formed).
Mars is smaller than Earth and so the core has cooled faster - this means Mars' molten core has (nearly) solidified and the spinning molten volume is too small to provide a strong enough magnetic field to protect it from the solar wind. Because of this, at some time in the past, Mars' atmosphere collapsed and the water (and maybe life) dried up.
So when did this happen? - about 3.5 billion years ago? - about the same time life first formed on Earth?
A coincidence too far maybe, but planetary transfer or spitting may have occurred in the catastrophic death of Mars. A death that may have been the spark that fused The Earth's primeval soup, and the death that was the beginning of life on Earth.
In short, 'We are the Aliens'.
One final question:
Can a theory - a thought - change the future of the past?
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Ok so I decided to start a blog. And so it begins before I started with Where's The Beef?, a rhetorical question signifying my quest for substance. At the time of writing I'm 27 and sitting in a cupboard with a bottle of red wine. 27 years have cumulated to this point. I think you get the point. I need to find the beef.
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