Dr. Alan Guth unveils the theory of inflation.

Liquid water flows intermittently on the surface of Mars. In those streams, microbial life may have managed to arise.

Scientists at the National Ignition Facility use lasers to create tiny fusion reactions, like those found in the sun.

Explore one of the first planets discovered in another star's habitable zone.

Explore one of the first planets discovered in another star's habitable zone.

Should our first off-world colony be in orbit, on the moon, or on Mars?

Even this small asteroid which burned up in the atmosphere still destroyed property and injured 1,500 people.

Astronomers combine visible light, infrared light, ultraviolet light, X-rays, and radio waves for a dazzling image.

Black Hole Collisions are the most powerful, violent events in the universe.

A Dyson sphere is a theoretical mega-structure that could only be built by an advanced civilization. Have astronomers discovered one?

The Arecibo Message was a radio signal sent into space with information about Earth in the hope that alien intelligence could understand it -- and respond.

If another civilization built a giant energy collector, we could detect it.

Before heading into the solar system and beyond, get the latest weather conditions.

Watch how these trillion-year stars "throw tantrums".

Astronomers find a pulsar feeding off the gas of a nearby star.

Jupiter’s Great Red Spot – the largest and longest-running storm in our solar system – is shrinking. Juan Lora, a planetary scientist at UCLA, explains why.

After Voyager 2 left Saturn, scientists noticed something wrong with the space probe's camera. To fix it from Earth, over a billion miles away, they had to come up with a creative solution.

The Family Portrait is an image of the Solar System acquired by Voyager 1 on February 14, 1990 from a distance of approximately 6 billion kilometers from Earth.

Astronomers find a pulsar feeding off the gas of a nearby star.

Watch how these trillion-year stars "throw tantrums".

Ion thrusters create small thrust levels in comparison to conventional chemical rockets, but achieve high specific impulse. They could be practical in the vacuum of space.

According to current quantum theory, particles can spontaneously appear from nowhere. Since matter and antimatter are opposites, they cancel each other out almost instantly when they come in contact..but how are they influenced by external magnetic fields

The Arecibo Message was a radio signal sent into space with information about Earth in the hope that alien intelligence could understand it -- and respond.

A Dyson sphere is a theoretical mega-structure that could only be built by an advanced civilization. Have astronomers discovered one?

Astronomers combine visible light, infrared light, ultraviolet light, X-rays, and radio waves for a dazzling image.

Even this small asteroid which burned up in the atmosphere still destroyed property and injured 1,500 people.

Should our first off-world colony be in orbit, on the moon, or on Mars?

Explore one of the first planets discovered in another star's habitable zone.

Explore one of the first planets discovered in another star's habitable zone.

Scientists at the National Ignition Facility use lasers to create tiny fusion reactions, like those found in the sun.

Liquid water flows intermittently on the surface of Mars. In those streams, microbial life may have managed to arise.

Dr. Alan Guth unveils the theory of inflation.