How does a black hole form from a massive star?
A) During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy of the core, the core will be compressed until it becomes a black hole.
B) Any star that is more massive than 8 solar masses will undergo a supernova explosion and leave behind a black-hole remnant.
C) If enough mass is accreted by a white dwarf star so that it exceeds the 1.4-solar-mass limit, it will undergo a supernova explosion and leave behind a black-hole remnant.
D) If enough mass is accreted by a neutron star, it will undergo a supernova explosion and leave behind a black-hole remnant.
E) A black hole forms when two massive main-sequence stars collide.
A) During a supernova, if a star is massive enough for its gravity to overcome neutron degeneracy of the core, the core will be compressed until it becomes a black hole.
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A) Jupiter's moon Europa B) Saturn's moon Titan C) Uranus's moon Miranda D) Neptune's moon Nereid E) Jupiter's moon Callisto
What kind of energy does gasoline possess?
A) mechanical B) kinetic C) potential D) radiative
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a. fusion of H nuclei; He b. fusion of He nuclei; H c. fission of H nuclei; He d. fission of He nuclei; H
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A) carbon combines with such biological molecules as DNA. B) oxygen combines with the carbon in such biological molecules as glucose. C) CO2 combines with the carbon in such biological molecules as glucose. D) CO2 combines with H2O. E) oxygen combines with such biological molecules as DNA.