Dr. Sten Odenwald is an astronomer and educator with the NASA Heliophysics Education Consortium, who also runs an online resource called The Astronomy Cafe. He received his PhD in astrophysics from ...

If not in visible stars and galaxies, the most likely hiding place for the matter is in the dark space between galaxies.

An invisible monster lurks beyond the stars of the constellation Sagittarius near the border with Scorpius: a supermassive black hole, designated as Sagittarius A* (pronounced “Sagittarius A-star”), ...

OAKLAND (KGO) -- It's a breakthrough that is thrilling the world - humanity's first look at a black hole. "We have seen what we have thought was unseeable," said Shep Doeleman, an astronomer at the ...

(This article was originally published in the May 2022 issue of Astronomy). St. Augustine said of time, “If no one asks me, I know what it is. If I wish to explain to him who asks, I don’t know.” Time ...