The Spitzer Space Telescope website will be down on Tuesday July 29th from 9am PST to 10am PST for server maintenance. Thank you for your patience.

Download Video

Video Information

Subscribe to Series

10.14.05

What Is a Brown Dwarf?

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

Browse Videos in Ask an Astronomer

2040100 per page

Details or Icons

Page-nav-left-disabled Page 1 of 2 Page-nav-right

Go to page

08.26.09

Where Is the Center of the Universe?

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

Watch now

02.05.09

W-5 Star-Forming Region

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

Watch now

12.22.08

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...

Watch now

10.23.08

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.

Watch now

08.25.08

Spitzer's Fifth Anniversary

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

Watch now

07.01.08

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...

Watch now

05.08.08

Can a Planet Have Two Suns?

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

Watch now

04.10.08

Can a Galaxy Die?

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

Watch now

03.13.08

Why Aren't There Any Green Stars?

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

Watch now

02.13.08

How Do You Discover an Asteroid?

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

Watch now

12.18.07

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...

Watch now

11.05.07

M51 and Gizmo

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

Watch now

09.14.07

What Happens When Galaxies Collide?

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

Watch now

07.27.07

What Is the Nearest Galaxy to the Milky Way?

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

Watch now

02.12.07

Why Isn't Pluto a Planet Any More?

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

Watch now

08.24.06

How Can We See a Black Hole?

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

Watch now

05.24.06

What Is a Redshift?

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

Watch now

12.09.05

Do the Stars Really Move?

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

Watch now

10.25.05

Why Do We See Spiral Arms in Some Galaxies?

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

Watch now

Now Playing

10.14.05

What Is a Brown Dwarf?

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

Watch now