Exobiology Archive

Liquid Water and Mars

We have long known that there was once water on Mars – the real question was whether liquid water still exists on the Red Planet, or whether it long ago dissipated into space. This week, …

Impact Craters and Life on Mars

The search for signs of life on Mars has been a little frustrating at times. The discovery that there was water (and probably lots of it) on Mar’s surface in the not too-distant past, and …
Rosetta and its comet

The Water of Comet 67P

Where did the water on Earth come from? The early Earth was a very hot, very dry place, but over time it accumulated water to form our massive oceans and lakes. For a long time, …
The Link Between Comets and Biology

The Link Between Comets and Biology

For several  months, Comet ISON was the center of attention in the scientific community, and for a good reason. After a journey that lasted almost a million years, ISON put on a spectacular show right …