April 10, 2016

A simulated color image of Cassiopeia A, combining information from three sources: red - information from the Spitzer Space Observatory, orange - from Hubble, and green and blue - from Chandra

Supernovae showered radioactive materials on Earth

Artist rendering of a hypothetical moon orbiting a planet discovered in a dense three-star system. Image: NASA/Caltech

A planet was discovered in a system of three suns