In Astronomy
- Dark star (Newtonian mechanics), a theoretical star that has a surface escape velocity that equals or exceeds the speed of light
- Dark star (dark matter), a theoretical star heated by dark matter annihilation in the early universe
- Dark energy star, a hypothetical alternative to black holes
- Black star (semiclassical gravity), a theoretical star built using semiclassical gravity as an alternative to a black hole
- Black hole, any region of space time where escape to the outside universe is impossible
- Black dwarf, a type of degenerate dwarf star, specifically, a cold white dwarf
Read more about this topic: Black Star
Famous quotes containing the word astronomy:
“Awareness of the stars and their light pervades the Koran, which reflects the brightness of the heavenly bodies in many verses. The blossoming of mathematics and astronomy was a natural consequence of this awareness. Understanding the cosmos and the movements of the stars means understanding the marvels created by Allah. There would be no persecuted Galileo in Islam, because Islam, unlike Christianity, did not force people to believe in a “fixed” heaven.”
—Fatima Mernissi, Moroccan sociologist. Islam and Democracy, ch. 9, Addison-Wesley Publishing Co. (Trans. 1992)
“It is noticed, that the consideration of the great periods and spaces of astronomy induces a dignity of mind, and an indifference to death.”
—Ralph Waldo Emerson (1803–1882)