Stay updated with breaking news from Heberd Curtis. Get real-time updates on events, politics, business, and more. Visit us for reliable news and exclusive interviews.
Galaxy, any of the systems of stars and interstellar matter that make up the universe. Many such assemblages are so enormous that they contain hundreds of billions of stars. Virtually all galaxies appear to have been formed soon after the universe began, and they pervade all space that is viewable by modern telescopes.
These are 20 of the greatest astronomers of all time, beginning with the Charles Messier, the French Comet hunter.
One of greatest discoveries of the 20th Century was that there are galaxies beyond our own, and astronomer Edwin Hubble was a key figure in this revelation.
Gamma rays are high-energy photons produced by some of the most violent events in the universe. We explore this powerful radiation in more detail here.