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A cosmic quandary, risks of hatching early and more reader feedback

Your letters and comments on the August 6, 2016 issue of Science News

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6:31am, September 21, 2016

Cosmic mismatch

Researchers used supernovas, cosmic microwave background radiation and patterns of galaxy clusters to measure the Hubble constant — the rate at which the universe expands — but their results were mismatched, Emily Conover reported in “Debate persists on cosmic expansion” (SN: 8/6/16, p. 10).

Reader J.R. Kennedy thought that light-dimming space dust and debris might explain the discrepancy.

Gas and dust in space can have an impact on the brightness of standard candles — objects with known brightness such as type 1a supernovas and some variable stars

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