Matter & Energy

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air bubbles in a rock

NOT-SO-FRESH AIR  Ancient air embedded inside rock salt for 815 million years suggests that oxygen was already abundant when the first animals appeared. The microscopic air bubbles were trapped inside rectangular inclusions (one circled in red) in the rock.

spiral galaxy UGC 9391

UNRULY UNIVERSE  Different methods for measuring the universe’s expansion rate disagree. To make one such measurement, scientists observed Cepheid variable stars and a type 1a supernova in the spiral galaxy UGC 9391 (shown), located 130 million light-years away in the constellation Draco.

LUX detector

MISSING MATTER Scientists with the LUX experiment, shown above, have found no evidence for dark matter in their latest search.

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