Supernovae are one of the most extreme events in the known universe. They are caused by

A) the implosion of a white dwarf, which has run out of all its fuel.
B) a supermassive supergiant star undergoing a massive nuclear chain reaction.
C) the collapse of a supermassive supergiant star.
D) Any of the above.


Answer: C

Physics & Space Science

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High-temperature superconductors are made of

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The lifetime of uranium 238 is 6.0 × 109 y, and that of uranium 235 is 1.0 × 109 y. The present abundance of uranium 238 is 140 times the abundance of uranium 235. What was the ratio of abundances 1 billion years ago?

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