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Readers wonder about the universe's expansion and more

Your letters and comments on the November 25, 2017 issue of Science News

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1:34pm, January 24, 2018

Pedal to the universal metal

Some cosmologists hope to explain the universe’s accelerating expansion by fully accounting for the universe’s lumpiness, Emily Conover reported in “Simulating the universe using Einstein’s theory of gravity may solve cosmic puzzles” (SN: 11/25/17, p. 22).

The universe’s accelerating expansion “is apparently based on the observation of objects that are moving away from Earth at speeds that increase as the distance to the object from Earth increases,” reader Tom Phillips wrote. “But the greater the distance from Earth, the farther back in time the object is

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