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.

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

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.

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

Evidence shows that the Andromeda Galaxy is headed straight for our own. In the next few billion years, the two will collide. The Solar System will most likely be okay though.

Is an ocean actually critical for life to survive? Does that ocean have to be made of water?

Instead of lava, freezing water is believed to burst from Wright Mons on Pluto.

Photos from a zone on Mars called the Newton Crater are helping to shed light on the amount of water left on the planet. The moisture left is extremely salty, and possibly toxic to life forms.

Gravity from Jupiter and three neighboring moons twist Io's core, resulting in massive eruptions.

Methane is the primary ingredient in many of Saturn's moon's lakes and seas. Scientists designed a submarine that can withstand the volatile chemicals that will be found in these methane lakes.

Dead stars called magnetars create fast radio bursts, giving us insights into dark matter dark matter.

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.

A simulation shows how the existence of habitable galaxies depends on dark matter.

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.

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.

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