birth

The birth and death of the universe could depend on black holes

The universe is expanding. No one with expertise in astronomy or physics disagrees with this fact. Likewise, no one really disputes the fact that at some point, many billions of years in the future, the universe will expand too far– and running out of energy for further expansion. At that point, something has to change. …

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A meteorite bears the imprint of a supernova dating from before the birth of the solar system

A very strange meteorite discovered in western Egypt in 1996 may contain tiny pieces of debris from a supernova, and not just any supernova, but one created by the explosion of a white dwarf, the remnant core of a once Sun-like star. If so, it would be the first evidence of a relatively nearby supernova …

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