What is a Seyfert galaxy? - Astronomy gsusigmanu.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gsusigmanu.org Daily Mail and Mail on Sunday newspapers.
Galaxies are large systems of stars, gas, dust and dark matter that orbits a center and is bound by gravity. Learn about the characteristics of galaxies.
So much about galaxies remains a mystery. We know what they're made of and that we live in one (the Milky Way), but how many galaxies are in the universe?
What are Active Galactic Nuclei? universetoday.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from universetoday.com Daily Mail and Mail on Sunday newspapers.