This morning, several news outlets gave voice to an extraordinary claim: Comet 67P/Churyumov-Gerasimenko, where the spacecraft Philae awoke last month, could be home to alien life. But extraordinary claims, we all know, require extraordinary evidence. So guess what these morning’s claims were lacking!
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.