Where Is the Center of the Universe?
Dr. Varoujan Gorjian explains the mind-boggling expansion of the Universe.
Ask an Astronomer
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Real NASA astronomers answer questions about the exciting science of astronomy.
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.
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.
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.
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.
Can a Planet Have Two Suns?
Dr. Carolyn Brinkworth addresses a famous science fiction scenario in this 'Ask an Astronomer' video.
Can a Galaxy Die?
Dr. Varoujan Gorjian gives us the answer to this 'Ask an Astronomer' question.
Why Aren't There Any Green Stars?
Dr. Michelle Thaller answers this question for 'Ask an Astronomer.'
How Do You Discover an Asteroid?
Dr. Bidushi Bhattacharya helps us understand how astronomers find these tiny space rocks.