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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,
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, Emily Conover reported in “Debate persists on cosmic expansion” (SN: 8/6/16, p. 10).
Reader J,
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.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,
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, Conover says,
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. But astronomers correct for those discrepancies in their measurements.
In the absence of gas and dust, a candle’s apparent brightness should decrease in relation to its distance from Earth. “But if there’s dust in the way, it can make the candle dim more than that,” Conover says. “However,
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, 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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