Measurements of Starlink's "VisorSat" show SpaceX has succeeded in making a less reflective satellite. But it's still visible from dark-sky areas.
Jupiter and Saturn's "Great Conjunction" is a noteworthy event, but on the morning of March 25, 185 BC, an even grander planetary gathering greeted Babylonian sky watchers
Street lights contribute to light pollution, but they are far from the only culprits — and fixing street lights is far from the only solution.
This year’s award goes to three researchers who played key roles in developing the theoretical and observational evidence for black holes.
Firefighting crews held the line as wildfire threatened Mount Wilson; an amateur observatory built by the Tri-Valley Stargazers was not so lucky.
Stunning images of the night remind us why we need to protect dark skies. See the photos that won the International Dark-sky Association's contest.
NASA is renaming its next flagship space observatory to honor pioneering NASA astronomer and "Mother of Hubble," Nancy Grace Roman.
Scientists have used a famous "dark eclipse" of the Moon to help date ice cores collected in Greenland and the Antarctic.
When NASA's New Horizons flew by a distant Kuiper Belt Object on New Year's Day, they nicknamed it "Ultima Thule." Now, the object has received an official moniker: Arrokoth.
The 2019 Nobel Prize in Physics goes to James Peebles and to Michel Mayor and Didier Queloz. The prize, which will be split in half, honors discoveries that have offered new perspectives on our place in the universe.
As protests against the construction of the Thirty Meter Telescope continue, the directors of Maunakea Observatories have taken the unprecedented move of closing all observatories atop the mountain.
Neil Armstrong's and Buzz Aldrin's first steps on the Moon changed the world. But that the world would see them wasn't a given.
In 1900, a man named John Nevil Maskelyne filmed a solar eclipse — the first of its kind.