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Using data from NASA's Kepler space telescope, citizen scientists have discovered a planet roughly twice the size of Earth located within its star's habitable zone, the range of orbital distances where liquid water may exist on the planet's surface.

NASA's InSight lander is due to set its first science instrument on Mars in the coming days. But engineers here on Earth already saw it happen - last week.

Wendy Panero, professor of earth sciences at The Ohio State University, has developed a new way of thinking about a planet's habitability. What if, she wondered, the answer to habitability lies within the way rocks and water interact?

In their search for life in solar systems near and far, researchers have often accepted the presence of oxygen in a planet’s atmosphere as the surest sign that life may be present there. A new Johns Hopkins study, however, recommends a reconsideration of that rule

About 2.6 million years ago, an oddly bright light arrived in the prehistoric sky and lingered there for weeks or months.

New NASA research confirms that Saturn is losing its iconic rings at the maximum rate estimated from Voyager 1 & 2 observations made decades ago.

Outer solar system experts find 'far out there' dwarf planet.

Astrophysicists discover a large population of potential young planets in distant solar systems.

Astronomers have detected a bright X-ray outburst from a star in the Small Magellanic Cloud, a nearby galaxy almost 200,000 light years from Earth.

Fishermen would be puzzled if they netted only big and little fish, but few medium-sized fish. Astronomers likewise have been perplexed in conducting a census of star-hugging extrasolar planets.