The impact that carved out the South Pole-Aitken basin on the moon appears to have come from the north, not the south as ...

Not all stars are created equally. Astronomers believe that the first stars to form after the Big Bang were mostly made of ...

The interstellar comet 3I/ATLAS may be out of view of Earth, but orbiters on Mars were able to recently get a look at it.

Stevenson 218 is the largest known star in the universe, located about 18,900 light-years away in the constellation of Scutum and far surpassing even the sun in size and brightness. So immense that it ...

According to the equations that govern black holes, the larger one of these cosmic behemoths is the lower its average density ...

Scientists may have finally uncovered the mystery behind ultra-high-energy cosmic rays — the most powerful particles known in ...

On the night of Oct. 5, 1923, Edwin Hubble observed a strange star that flickered in intensity at regular intervals. The star ...

A black hole in a distant quasar is growing faster than the usual limit, according to Chandra observations. This may explain ...

A problem that has long been considered impossible to solve and that now, thanks to a breakthrough, can be calculated quickly ...

Avengers: Doomsday will change the Marvel Cinematic Universe forever--and fans have plenty of plausible theories about what ...

Astronomers and citizen scientists have uncovered the largest, most mysterious cosmic radio ring ever seen, twice the size of our galaxy, with intersecting rings that challenge what we know about ...

Dark energy, which drives the accelerated expansion of the Universe, is assumed to be constant since the Universe began by ...