Related terms:
solar masses
stellar black hole
rotating black hole
orbits
hubble sequence
nearby galaxies
radio source
active galaxy
accretion disc
spiral galaxies
ngc
million solar masses
spiral arms
knights of cydonia
active galactic nucleus
globular clusters
active galactic nuclei
galactic center
schwarzschild radius
schwarzschild
gravitational lensing
elliptical galaxy
accretion
starburst
gravitational time dilation
sagittarius
redshift
star formation
bulge
galaxia
Wikipedia sources:
Black hole
Supermassive black hole
Quasar
Galaxy
Supermassive Black Hole (song)
HAARP (album)
Schwarzschild radius
Sagittarius A*
Messier 87
Sombrero Galaxy
Knights of Cydonia
Twilight (soundtrack)
Wikipedia:Reference desk/Science
Spiral galaxy
General relativity
Galactic Center
Context for words:
supermassive
black
hole
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