The building blocks of life could have their beginnings in the tiny icy grains that make up the gas and dust found between the stars, and those icy grains could be the key to understanding how life can arise on planets. With help from students, researchers have discovered an important pair of prebiotic molecules in…
Exogenesis is the theory that the building blocks for life came from elsewhere in the universe. The trouble is it doesn't explain where those building blocks came from in the first place. But new calculations suggest one intriguing source: Earth.
Many of you have probably heard about asteroid 2005 YU55, the massive rocky body that tomorrow night will
collide with Earth in a ball of flames pass the planet safely, albeit closer than any asteroid in the last 35 years.
Score another point for exogenesis, the idea that life on Earth has extraterrestrial origins. For the first time, NASA has identified amino acids in a sample of material from a comet, suggesting a comet may have brought proteins to Earth.
Critics of exogenesis note that the proper conditions to maintain life are rare in the universe, and would not likely survive the trip inside Earth's atmosphere. But new data on comets offers evidence that our ancestors were, indeed, extraterrestrial.
Planet Earth might be home sweet home, but is it really humanity's birthplace? We explore science fiction stories where humans come from everywhere but Earth, be it by colonization, alien experiments, or good old-fashioned panspermia.
We usually think of asteroid impacts as harbingers of mass extinction, but they might be the reason life exists on our planet at all. It's possible for bacteria to hitch rides on rocks ejected by space impacts and move from planet to planet. We know that certain Earth bacteria are capable of surviving the hostile…