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: Compact Star
Famous quotes containing the word lifetime:
“Only Socrates knew, after a lifetime of unceasing labor, that he was ignorant. Now every high-school student knows that. How did it become so easy?”
—Allan Bloom (1930–1992)
“A lifetime of cleverness can be interrupted by moments of stupidity.”
—Chinese proverb.
“Diamonds may have been a girl’s best friend in an era when a woman’s only hope of having a high family income was to marry a man who was well-off, but today, marketable skills that will enable a woman to command a good income over her lifetime are a better investment.”
—Grace Baruch (20th century)