Astronomers are homing in on the whereabouts of a hidden giant planet in our solar system, and could discover the unseen beast in roughly a year.

It's looking less likely that a faraway star's strange dimming can be explained by a swarm of comets or an "alien megastructure."

Astronomers have spotted a dead star polluted with heavy elements, suggesting that the star recently chowed down on a water-laced asteroid.

Scientists at space agencies across the world are using satellite images and other technologies to aid those affected by Nepal's earthquake.

A massive whale's nerves can unfold and recoil like a bungee cord, explaining how they can balloon their mouths while feeding.

For the first time, scientists have imaged thunder, shedding light on the physical processes that create it.

Scientists are striving to learn from the latest volcanic eruption in Chile.

A young star in Orion's dusty nebula roughly 1,400 light-years away has erupted after munching down gas and dust.

Three male Amur tiger cubs born in the early hours of April 21 are currently in an incubator after their mother didn’t nurse them.

A new set of 56 interactive maps estimates public opinion on climate change across the United States from the national to county level.

An image, released by NASA's Earth Observatory, shows pulses of laser light hitting Arctic sea ice — the ice that forms and floats in Arctic waters.

The nonprofit American Rivers has deemed the Colorado River in the Grand Canyon the most endangered river in America in 2015.

A remarkable heat wave warmed Antarctica's northernmost peninsula to slightly above 63 degrees Fahrenheit (17.5 degrees Celsius) two weeks ago — a record high for the normally cold continent.

It’s a great day for particle physics fans: the world’s largest atom smasher has been cleared to start running again as early as this weekend.

A new map shows the distribution of lightning strikes across the Earth over the past two decades.

Antarctic octopuses survive subzero temperatures because of the blue pigments in their blood, a new study finds.

A new global map of water surface temperatures is so visually stunning that it easily may be mistaken for art.

A little injection of the so-called 'love' hormone, oxytocin, can sober up drunken rats, reversing their clumsy alcohol-induced behaviors, scientists report.