Sarah Lewin

India's recent anti-satellite test created 60 pieces of orbital debris big enough to track, 24 of which rise higher than the International Space Station's orbit around Earth.

A newly discovered object is the most-distant body ever observed in the solar system — and the first object ever found circling at more than 100 times the distance from Earth to the sun.

SpaceX's Dragon spacecraft lifted off into clear blue skies today (Dec. 5), but its first stage spiraled down in a failed landing.

In his final book, released Oct. 16, Stephen Hawking tackles big questions about the universe, delving into physics, cosmology, the existence of God and the future direction of humanity.

The clouds' rippling and flow reflect the movement of air in the upper atmosphere resulting from a phenomenon called atmospheric gravity waves.

The Mendocino Complex Fire, the largest blaze in California's history, releases clouds of smoke in new photos from NASA, and fires blazing over Canada are visible from a million miles away in space.

SpaceX's giant new rocket, the Falcon Heavy, is set for its risky first test launch today (Feb. 6) from the historic Pad 39A at Kennedy Space Center in Florida.

A new NASA mission, the first to hitch a ride on a commercial communications satellite, will examine Earth's upper atmosphere to see how the boundary between Earth and space changes over time.

Einstein would be pleased — but flabbergasted — to hear the details of humanity's first direct detection of gravitational waves, according to one of three new Nobel winners for the discovery.

Early this morning (Sept. 6) the sun released two powerful solar flares — the second was the most powerful in more than a decade.

After decades of hunting, astronomers have tracked down the origin of a nova first recorded by Korean royal astrologers nearly 600 years ago.

Researchers have used brain-like "neural networks" to analyze key distortions in space-time 10 million times faster than conventional methods can do so.

A growing number of researchers think that the sun is actually larger than commonly thought.

The eight-legged micro-animal called a tardigrade could survive nearly all the way until the death of the sun, a new study suggests — long after humans are history.

In a new experiment, researchers have created a super-dense version of ice found deep within icy moons and colliding comets, and watched it form in nanoseconds.

NASA's Kepler Space Telescope has been used to detect 219 new planet candidates, including 10 in the so-called habitable zones of the stars they orbit.

Here's how NASA scientists figure out exactly where the moon's shadow will fall on the surface of the Earth, down to the city block.