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What Happens When Galaxies Collide?

Dr. Varoujan Gorjian takes us inside galactic collisions in this 'Ask an Astronomer' video.

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Where Is the Center of the Universe?

Dr. Varoujan Gorjian explains the mind-boggling expansion of the Universe.

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W-5 Star-Forming Region

Visit the W-5 star-forming region with 'Ask an Astronomer'!

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Why Is the Sky Blue?

In this 'Ask an Astronomer' episode, Dr. Carolyn Brinkworth fills us in on what the color of the sky has to do with f...

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What's Between the Stars?

In this 'Ask an Astronomer' episode, Dr. Michelle Thaller explains how there can be an interstellar medium in a vacuum.

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Spitzer's Fifth Anniversary

This 'Ask an Astronomer' special looks at some of the biggest discoveries from NASA's Spitzer Space Telescope over th...

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What Will Happen to the Earth When the Sun Dies?

Our Sun won't last forever. Dr. Carolyn Brinkworth explains the ramifications for our home planet in this 'Ask an Ast...

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Can a Planet Have Two Suns?

Dr. Carolyn Brinkworth addresses a famous science fiction scenario in this 'Ask an Astronomer' video.

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Can a Galaxy Die?

Dr. Varoujan Gorjian gives us the answer to this 'Ask an Astronomer' question.

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Why Aren't There Any Green Stars?

Dr. Michelle Thaller answers this question for 'Ask an Astronomer.'

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How Do You Discover an Asteroid?

Dr. Bidushi Bhattacharya helps us understand how astronomers find these tiny space rocks.

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Infrared: More Than Your Eyes Can See

Dr. Michelle Thaller explains infrared light in this older video, produced by NASA's Spitzer Space Telescope (then kn...

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M51 and Gizmo

In this animated 'Ask an Astronomer' special, innocent alien M51 moves the Earth into a closer orbit around the sun, ...

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What Happens When Galaxies Collide?

Dr. Varoujan Gorjian takes us inside galactic collisions in this 'Ask an Astronomer' video.

Watch now


What Is the Nearest Galaxy to the Milky Way?

Dr. Michelle Thaller explains that the answer isn't as simple as you might think!

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Why Isn't Pluto a Planet Anymore?

Dr. Robert Hurt explains why Pluto got... well... plutoed.

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How Can We See a Black Hole?

If no light escapes from a black hole, how can we detect them? 'Ask an Astronomer' explains.

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What Is a Redshift?

'Ask an Astronomer' uses an astronomer, a flying saucer, and a cow to help explain this difficult astronomical concep...

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Do the Stars Really Move?

The answer to this 'Ask an Astronomer' question may surprise you!

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Why Do We See Spiral Arms in Some Galaxies?

'Ask an Astronomer' explains the morphology of one of the most common types of galaxy.

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What Is a Brown Dwarf?

'Ask an Astronomer' explains one of the strangest objects in outer space.

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