Mysterious Bright Flashes in the Night Sky Baffle Astronomers Celestial transients shine furiously and briefly. Astronomers ...

A skydiver leaping into the void with the Sun at their back, a sloth clinging to a barbed-wire fence, a microscopic tattoo on ...

NASA’s Roman Space Telescope will study thousands of cosmic voids, mapping galaxy distributions to investigate dark matter, dark energy and the universe’s large-scale structure through precise ...

New NASA-backed research using the Chandra X-ray Observatory suggests many small galaxies may lack supermassive black holes, ...

NASA's Nancy Grace Roman Space Telescope team has released detailed plans for a major survey that will reveal our home galaxy ...

This week delivers both the Sagittarius new moon and the winter solstice. The sun and moon meet in Sagittarius for the new ...

A new study, appearing in The Astrophysical Journal and based on observations from NASA's Chandra X-ray Observatory, ...

The Geminid meteor shower put on a dazzling cosmic firework show when it peaked overnight on Dec. 13 as shards of the solar ...

A stray comet from another star swings past Earth this week in one last hurrah before racing back toward interstellar space.

Smaller black holes tend to attract less material, making them naturally dimmer. Chandra would miss many of these faint ...

While the 21st century has been bumpy, it has also ushered in monumental scientific and technological breakthroughs that have ...

Astronomers usually detect black holes by looking for X-rays. When gas and dust fall toward a black hole, they heat up and ...