A new study has found that the seven planets orbiting the nearby ultra-cool dwarf star TRAPPIST-1 are all made mostly of rock, and some coul...

This artist concept shows K2-138, the first multi-planet system discovered by citizen scientists. The central star is slightly smaller and c...

This image, captured by ESO’s Very Large Telescope (VLT) at Paranal, shows a small part of the well-known emission nebula, NGC 6357, located...