In a galaxy where change is usually measured in millennia, NASA has assembled a movie that shows Kepler’s supernova remnant ...

An illustration of a young solar system immersed in high-energy cosmic rays from a nearby supernova. Unlike considering only direct injection of supernova ejecta, this process naturally explains key ...

This article (originally published Aug. 13, 2025) has been updated to include new text and illustrations featured in the Jan.