Ancient Comets Carried Organic Compounds, But They Didn't Survive Crashing Into Earth
Perhaps the biggest mystery we face is life on Earth started. One hypothesis says that comets, which are known to carry important chemicals in abiogenesis, delivered these compounds to Earth, leading to the appearance of life. But new research concludes that that is highly unlikely.
We haven't written up this one. Universe Today has the full story — the link below goes straight to it.