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.

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.

The NASA probe endures intense radiation to learn Jupiter's secrets

Mike explains how you can join the astronaut club.

Mike talks about tourism - in space.

Lightning on Jupiter extracts carbon from methane, turning it into diamonds

Mike talks about his favorite memory from orbit.

When astronauts explore Mars, they'll need a way around communication delays of up to 22 minutes.

Mike talks about the importance of teamwork.

What formed Orcus Patera? An asteroid, a volcano, or possibly Mars' third moon?

Mike reveals the moment he thought, “Maybe this wasn’t such a good idea."

Earth and Venus endured massive impacts in the distant past.

Historic highlights from the record-setting Saturn probe.