27 years ago on April 1, 1997, Comet Hale-Bopp was at perihelion, its closest point to the sun. This comet was widely seen from the Northern Hemisphere.
NASA's Hubble Space Telescope has found older and less massive brown dwarfs tend to be alone with no companions, unlike younger and larger brown dwarfs.
Citizen scientists using imagery from the SOHO solar observatory have now discovered their 5000th comet. You can help, too! Join the Sungrazer Project.
An asteroid created a large Martian crater called Corinto, about 2 million years ago. Debris from the impact also created 2 billion smaller craters on Mars.
Scientists using the Event Horizon Telescope imaged the polarized light from our Milky Way's black hole for the first time. Learn more about what that means.