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Genetics

This gene may help worms live longer, but not healthier

Antiaging therapies may have trade-offs, research on worms suggests.

Cosmology

Scientists still can’t agree on the universe’s expansion rate

A mismatch in measurements of how fast the universe is expanding might not be real, a study hints.

Earth

Night-shining ‘noctilucent’ clouds have crept south this summer

Clouds high in the atmosphere that catch the sun’s rays even after sundown may be seen farther from the poles due to an increase in moisture in the air.

Astronomy

Gaps in gas disks around stars may not always mark newborn planets

New research has prompted a rethink of the theory that gaps in planet-forming disks around young stars mark spaces where planets are being created.