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,
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, p. 10),
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.
Reader J.R. Kennedy thought that light-dimming space dust and debris might explain the discrepancy,
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.
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, Conover says. But astronomers correct for those discrepancies in their measurements,
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.
In the absence of gas and dust,
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, a candle’s apparent brightness should decrease in relation to its distance from Earth. “But if there’s dust in the way,
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, it can make the candle dim more than that,
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,” Conover says. “However, this intervening material doesn’t dim the candle quite in the same way as distance does. It will dim the shorter,
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, bluer wavelengths of light more than the redder ones. Astronomers can look for this effect to identify the impact of dust and correct for it.” So the mismatch stands.


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