A new discovery of organic molecules in Martian sediment doesn't prove there was life on the red planet. But it does help build the case for it.

Normally on Earth liquid water means life. But researchers found a place where that isn't the case…

A strain of salmonella immune to antibiotics of last resort has been found in the United States. This should be a wakeup call for both Big Pharma scientists and government regulators.

Scientists are curious about some strange atmospheric signatures on Titan that could signal exotic life. But it's not quite a slam dunk for alien hunters.

While we strive to avoid contaminating alien worlds with our toughest germs, what if it's not only inevitable, but could actually lead to some good over the eons?

If we find life on Mars, it might be surprisingly difficult to confirm that it's actually Martian.