Matter & Energy

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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.

electrons illustration

ELECTRONS ATTRACT Although electrons normally repel one another, a new study shows that two electrons (green in this illustration) can attract, thanks to their repulsion from other electrons (purple).

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