Astrobiology Magazine: While life is everywhere on Earth, there is much debate about how it began. Some believe it originated naturally from the chemistry found on our planet as it evolved. Others hypothesize that life — or at least the building blocks of it like DNA — crashed onto our planet from such extraterrestrial bodies as comets.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
The asteroid zoomed by Earth at a perfectly safe distance of around 1.8 million miles (2.9 kilometers).
Images show surprise changes to the spacecraft as it interacted with the atmosphere.
