Record-breaking pulsar takes tests of general relativity into new territory.

Researchers have designed a low-cost, long-life battery that could enable solar and wind energy to become major suppliers to the electrical grid.

Finding is related to snow atop sea ice, adding a new dimension to scientific concerns about loss of Arctic ice.

The April 25-26 lunar eclipse is a partial, lasting just 27 minutes - the third-shortest partial lunar eclipse of the 21st century.

The findings indicate that even at remote eastern Sierra locations, ozone air pollution may be a problem for human and ecosystem health.

On April 20th and 21st of 2013, NASA was able to capture three coronal mass ejections (CMEs) in two days!

Radiation emitted in the vicinity of black holes could be used to measure distances of billions of light years, says researcher.

In January, 2014, Earth will pass through a stream of fine-grained debris from Comet ISON. Scientists say the resulting shower could have some interesting properties.

Astronomers have used NASA's Hubble Space Telescope to photograph the iconic Horsehead Nebula in a new, infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on April 24, 1990.

NASA's Kepler mission has discovered two new planetary systems that include three super-Earth-size planets in the "habitable zone," the range of distance from a star where the surface temperature of an orbiting planet might be suitable for liquid water.