Ask an Astronomer

By NASA's Spitzer Science Center and Infrared Processing and Analysis Center

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Real NASA astronomers answer questions about the exciting science of astronomy.

Episode Date
Where Is the Center of the Universe?
Dr. Varoujan Gorjian explains the mind-boggling expansion of the Universe.
Aug 26, 2009
W-5 Star-Forming Region
Visit the W-5 star-forming region with 'Ask an Astronomer'!
Feb 05, 2009
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 finding life on distant planets.
Dec 22, 2008
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.
Oct 23, 2008
Spitzer's Fifth Anniversary
This 'Ask an Astronomer' special looks at some of the biggest discoveries from NASA's Spitzer Space Telescope over the last five years.
Aug 25, 2008
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 Astronomer' video.
Jul 01, 2008
Can a Planet Have Two Suns?
Dr. Carolyn Brinkworth addresses a famous science fiction scenario in this 'Ask an Astronomer' video.
May 08, 2008
Can a Galaxy Die?
Dr. Varoujan Gorjian gives us the answer to this 'Ask an Astronomer' question.
Apr 10, 2008
Why Aren't There Any Green Stars?
Dr. Michelle Thaller answers this question for 'Ask an Astronomer.'
Mar 13, 2008
How Do You Discover an Asteroid?
Dr. Bidushi Bhattacharya helps us understand how astronomers find these tiny space rocks.
Feb 13, 2008
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 known as the Space Infrared Telescope Facility) before it launched.
Dec 18, 2007
M51 and Gizmo
In this animated 'Ask an Astronomer' special, innocent alien M51 moves the Earth into a closer orbit around the sun, and learns an important lesson about life in the Universe.
Nov 05, 2007
What Happens When Galaxies Collide?
Dr. Varoujan Gorjian takes us inside galactic collisions in this 'Ask an Astronomer' video.
Sep 14, 2007
What Is the Nearest Galaxy to the Milky Way?
Dr. Michelle Thaller explains that the answer isn't as simple as you might think!
Jul 27, 2007
Why Isn't Pluto a Planet Anymore?
Dr. Robert Hurt explains why Pluto got... well... plutoed.
Feb 12, 2007
How Can We See a Black Hole?
If no light escapes from a black hole, how can we detect them? 'Ask an Astronomer' explains.
Aug 24, 2006
What Is a Redshift?
'Ask an Astronomer' uses an astronomer, a flying saucer, and a cow to help explain this difficult astronomical concept in simple terms.
May 24, 2006
Do the Stars Really Move?
The answer to this 'Ask an Astronomer' question may surprise you!
Dec 09, 2005
Why Do We See Spiral Arms in Some Galaxies?
'Ask an Astronomer' explains the morphology of one of the most common types of galaxy.
Oct 25, 2005
What Is a Brown Dwarf?
'Ask an Astronomer' explains one of the strangest objects in outer space.
Oct 14, 2005
Do Other Solar Systems Exist?
'Ask an Astronomer' explains how we detect planets around other stars.
Oct 14, 2005
Are Other Solar Systems Like Our Own?
Solar systems come in a large variety of flavors, as this 'Ask an Astronomer' video shows.
Oct 14, 2005
How Do Stars Live and Die?
'Ask an Astronomer' tackles stellar evolution.
Oct 14, 2005
Why Is Spitzer Painted Black?
The Spitzer Space Telescope has a funny paint job. This 'Ask an Astronomer' segment explains why.
Oct 14, 2005
Why Are Solar Eclipses Only Visible in Some Parts of the World?
This 'Ask an Astronomer' episode explains eclipses of the sun and why they can't be seen everywhere.
Oct 14, 2005
What Causes an Eclipse of the Moon?
This 'Ask an Astronomer' episode explains lunar eclipses.
Oct 14, 2005
Why Does the Moon Look Like It Changes?
Phases of the Moon are clearly explained in this 'Ask an Astronomer' episode.
Oct 14, 2005
Can You Feel a Solar Wind?
This 'Ask an Astronomer' segment attempts to explain what a solar wind is (and is not).
Oct 14, 2005
Why Doesn't the Moon Fall Down?
This 'Ask an Astronomer' episode explains how orbits work.
Oct 14, 2005