Fate
A white dwarf is stable once formed and will continue to cool almost indefinitely; eventually, it will become a black white dwarf, also called a black dwarf. Assuming that the Universe continues to expand, it is thought that in 1019 to 1020 years, the galaxies will evaporate as their stars escape into intergalactic space., §IIIA. White dwarfs should generally survive this, although an occasional collision between white dwarfs may produce a new fusing star or a super-Chandrasekhar mass white dwarf which will explode in a Type Ia supernova., §IIIC, IV. The subsequent lifetime of white dwarfs is thought to be on the order of the lifetime of the proton, known to be at least 1032 years. Some simple grand unified theories predict a proton lifetime of no more than 1049 years. If these theories are not valid, the proton may decay by more complicated nuclear processes, or by quantum gravitational processes involving a virtual black hole; in these cases, the lifetime is estimated to be no more than 10200 years. If protons do decay, the mass of a white dwarf will decrease very slowly with time as its nuclei decay, until it loses enough mass to become a nondegenerate lump of matter, and finally disappears completely., §IV.
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Famous quotes containing the word fate:
“For after all man knows mighty little, and may some day learn enough of his own ignorance to fall down again and pray. Not that I care. Only, if such is God’s will, and Fate and Evolution—let there be God!”
—Henry Brooks Adams (1838–1918)
“O divine art of sublety and secrecy! Through you we learn to be invisible, through you inaudible and hence we can hold the enemy’s fate in our hands.”
—Sun Tzu (6th–5th century B.C.)
“And last of all, high over thought, in the world of morals, Fate appears as vindicator, levelling the high, lifting the low, requiring justice in man, and always striking soon or late when justice is not done. What is useful will last, what is hurtful will sink.”
—Ralph Waldo Emerson (1803–1882)