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Ask an Astronomer
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.
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August 26, 2009
Where Is the Center of the Universe?
Dr. Varoujan Gorjian explains the mind-boggling expansion of the Universe.
February 5, 2009
W-5 Star-Forming Region
Visit the W-5 star-forming region with 'Ask an Astronomer'!
December 22, 2008
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.
October 23, 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.
August 25, 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.
July 1, 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.
May 8, 2008
Can a Planet Have Two Suns?
Dr. Carolyn Brinkworth addresses a famous science fiction scenario in this 'Ask an Astronomer' video.
April 10, 2008
Can a Galaxy Die?
Dr. Varoujan Gorjian gives us the answer to this 'Ask an Astronomer' question.
March 13, 2008
Why Aren't There Any Green Stars?
Dr. Michelle Thaller answers this question for 'Ask an Astronomer.'
February 13, 2008
How Do You Discover an Asteroid?
Dr. Bidushi Bhattacharya helps us understand how astronomers find these tiny space rocks.
December 18, 2007
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.
November 5, 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.
September 14, 2007
What Happens When Galaxies Collide?
Dr. Varoujan Gorjian takes us inside galactic collisions in this 'Ask an Astronomer' video.
July 27, 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!
February 12, 2007
Why Isn't Pluto a Planet Anymore?
Dr. Robert Hurt explains why Pluto got... well... plutoed.
August 24, 2006
How Can We See a Black Hole?
If no light escapes from a black hole, how can we detect them? 'Ask an Astronomer' explains.
May 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.
December 9, 2005
Do the Stars Really Move?
The answer to this 'Ask an Astronomer' question may surprise you!
October 25, 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.
October 14, 2005
What Is a Brown Dwarf?
'Ask an Astronomer' explains one of the strangest objects in outer space.
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