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Planetary Science

Moon material on Earth

Scientists now think that tektites are a type of impactite, formed during the rapid heating and cooling of material ejected when a meteorite strikes Earth.

Astronomy

Astronomers explain planets’ backward motion

Giant planets in distant orbits may be reversing the direction of their closer-in neighbors.

Animals

How ticks get under your skin

A close look at a tick’s mouthparts reveals enviable burrowing tools.

Life

Steroids boost muscles for the long haul

Experiments in mice suggest that effects don’t end when doping does.

Cosmology

Dark energy search gets murkier

Supernova measurements muddle scientists’ efforts to explain universe’s accelerating expansion.