Hold the nectar, these butterflies feed on galls and honeydew

While most butterflies feed on nectar from flowers, researchers from the University of Connecticut believe that northern oak hairstreaks feed on non-nectar sources such as oak galls and honeydew from aphids and other insects.

Dawn maps Ceres craters where ice can accumulate

Scientists with NASA's Dawn mission have identified permanently shadowed regions on the dwarf planet Ceres. Most of these areas likely have been cold enough to trap water ice for a billion years, suggesting that ice deposits ...

Frosty cold nights year-round on Mars may stir dust

Some dusty parts of Mars get as cold at night year-round as the planet's poles do in winter, even regions near the equator in summer, according to new NASA findings based on Mars Reconnaissance Orbiter observations.

Dallas robot bomb highlights technology in policing

The "bomb robot" killing of a suspected Dallas shooter may be the first lethal use of an automated device by American police, and underscores growing role of technology in law enforcement.

Study explains why galaxies stop creating stars

Galaxies come in three main shapes - elliptical, spiral (such as the Milky Way) and irregular. They can be massive or small. To add to this mix, galaxies can also be blue or red. Blue galaxies are still actively forming stars. ...

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