Although we know that supermassive black holes (millions of times the mass of our sun) lurk at the center of most galaxies, ...

These icy bodies contain organic molecules — and don’t fall into any known category of celestial object we’ve seen before.

For the past 35 years, an unusual radio signal from deep space has continued to reach Earth at regular intervals — every 22 ...

A massive black hole at the heart of a galaxy in the Virgo constellation is waking up, shooting out intense X-ray flares at ...

The Leonids is a typical meteor shower most years, on pace with others such as the Lyrids and Orionids with around 15 ...

Being the furthest planet from Earth, we don't know much about Neptune, but recent observations have revealed something glowing in its sky.

Scientists have uncovered the strongest evidence yet for the existence of elusive intermediate-mass black holes (IMBHs), long ...

An international team of astronomers using the NASA/ESA Hubble Space Telescope has made new measurements of Uranus’ interior rotation rate with a novel technique, achieving a level of accuracy 1 000 ...

Two Texas senators have introduced legislation that would strip the Smithsonian of the retired space shuttle Discovery and ...

This isotope is found at a ratio of about one per 2,500 helium-4 ions, the latter being the common version of helium.

Astronomers are investigating the longest and most energetic bursts of X-rays seen from a newly awakened black hole. Watching this strange behavior unfold in real time offers a unique opportunity to ...

In the intense early days of the space race, a small, unusual satellite was launched into space sixty-seven years ago.