Imagine Earth at a time when it was almost unrecognizable—a landscape that was barren and with barely breathable air. That is what Earth looked like about 1.75 billion years ago. But scientists now ...

The mystery of how life on Earth originated , and whether it exists elsewhere in the universe, are "the raison d’être of space exploration", said Louis Friedman, co-founder of the Planetary Society.

The origin of life on Earth is still a hotly-debated topic. There are many different theories on how life was kick-started, as well as various experiments underway attempting to understand the ...