"Sprites," vibrant light bursts during storms, are actually tiny light balls speeding through the atmosphere at one-tenth the speed of light, scientists say.

The latest crisis on the International Space Station raises the question: How to evacuate in an emergency?

A space shuttle leaves a ghostly knot above Florida, soccer stars scrimmage on a glacier, and Spaniards leap seven babies in a single bound.

Plants are able to recognize close family members, treating them differently than unrelated neighbors, new research suggests.

The dwarf planet that led to Pluto's demotion—Eris—is also a third bigger than the former ninth planet, a new study reveals.

A large basin on Mars's northern plains really did once hold a giant ocean, suggests new research into the planet's shifting poles.

A type of pest-resistant, genetically modified crop does not seem to kill harmless insects such as butterflies, a major review of studies claims.

The well-preserved mummy known as Oetzi died from an arterial lesion inflicted by an arrow in his back, modern medical technology suggests.

Evidence of an expanding universe will have disappeared from view in a hundred billion years, throwing any future versions of cosmic science back to 19th-century models, according to a new essay.

As global temperatures have risen, rainfall has kept pace, a new study shows—results that suggest many of the world's most sophisticated climate models are flawed.

A thin layer of the sun's atmosphere called the chromosphere is heated up by sound waves carried from the star's interior by magnetic fields, new research suggests.

Two genes that are still evolving in humans might have subtle effects on people's abilities to learn different types of languages, according to new research.

Astronomers found 28 new planets outside the solar system in the past year, and the increased rate of exoplanet discovery suggests the galaxy is brimming with other worlds.

Summer travel season starts this weekend, and what better time to take a closer look at this vacation mecca? And we do mean closer.

An accidental skid by the Mars rover Spirit turned up what experts say is proof that the red planet was once quite wet.