Sidetracked from chemistry by COVID, Sandra O’Neil found a secret hidden among the stars
Samples and satellite observations hint at how raining meteorites may have made the planet habitable
One candidate is a fast-spinning star that collapsed and exploded 13 billion years ago
After 70 years, a timeline emerges for the mysterious Oort cloud that surrounds our solar system
The meaning of a massive flare on Proxima Centauri, the closest star to the solar system