Lifetime
Although compact stars may radiate, and thus cool off and lose energy, they do not depend on high temperatures to maintain their pressure. Barring external perturbation or baryon decay, they will persist virtually forever, although black holes are generally believed to finally evaporate from Hawking radiation. Eventually, given enough time (when we enter the so-called degenerate era of the universe), all stars will have evolved into dark, compact stars.
A somewhat wider class of compact objects is sometimes defined to contain, as well as compact stars, smaller solid objects such as planets, asteroids, and comets. These compact objects are the only objects in the universe that could exist at low temperatures. There is a remarkable variety of stars and other clumps of matter, but all dense matter in the universe must eventually end in one of only five classes of compact objects.
Read more about this topic: Degenerate Stars
Famous quotes containing the word lifetime:
“Sometimes a neighbor whom we have disliked a lifetime for his arrogance and conceit lets fall a single commonplace remark that shows us another side, another man, really; a man uncertain, and puzzled, and in the dark like ourselves.”
—Willa Cather (1873–1947)
“For the bright side of the painting I had a limited sympathy. My visions were of shipwreck and famine; of death or captivity among barbarian hordes; of a lifetime dragged out in sorrow and tears, upon some gray and desolate rock, in an ocean unapproachable and unknown.”
—Edgar Allan Poe (1809–1849)
“I have a lifetime appointment and I intend to serve it. I expect to die at 110, shot by a jealous husband.”
—Thurgood Marshall (1908–1993)