Astronomers have identified a frozen, Earth-sized world circling a nearby sunlike star, a find that sharpens the search for planets that resemble our own while underscoring how rare truly temperate ...

Northern lights occur when a solar flare interacts with Earth's atmosphere.

A new sunspot group has quickly grown and is spewing out the most intense type of solar flare. Effects on Earth are forecast ...

A newly identified Earth-sized exoplanet with a year-long orbit may lie near its star’s habitable zone, but extreme cold could limit its chances of hosting liquid water.

The space rock is hurtling through our cosmic backyard at a zippy 26,200 miles per hour, according to the space agency.

A Mars spacecraft has now been AWOL for more than a month. But NASA hasn't given up hope of restoring contact with the MAVEN ...

A jaw-dropping image shows vibrant aurora over Earth this week. NASA astronaut Chris Williams captured the spectacle from the ...