Ask an Astronomer Videos

http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ask_astronomer/video/index.html

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

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• What Will Happen to the Earth When the Sun Dies?

  [Duration 3:58, 32.7 MB]

  Tue, 01 Jul 2008 09:20:00 PDT

  
  Our Sun won't last forever. Dr. Carolyn Brinkworth explains the ramifications for our home planet.
  

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• Can a Planet Have Two Suns?

  [Duration 3:30, 27.3 MB]

  Thu, 08 May 2008 10:00:00 PDT

  
  Dr. Carolyn Brinkworth examines whether science fiction could be science fact.
  

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• Can a Galaxy Die?

  [Duration 2:07, 17.3 MB]

  Thu, 10 Apr 2008 09:40:00 PDT

  (1 rating)
  Dr. Varoujan Gorjian fills us in on the end of a galaxy.
  

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• Why Aren't There Any Green Stars?

  [Duration 3:17, 23.4 MB]

  Thu, 13 Mar 2008 14:25:00 PDT

  
  Dr. Michelle Thaller explains why some stars appear red or blue, but not green.
  

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• How Do You Discover an Asteroid?

  [Duration 2:04, 14.3 MB]

  Wed, 13 Feb 2008 11:04:00 PST

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

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• Special: Infrared: More Than Your Eyes Can See

  [Duration 6:58, 51.7 MB]

  Tue, 18 Dec 2007 13:30:00 PST

  (1 rating)
  Dr. Michelle Thaller explains infrared light in this classic video.
  

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• Special: M51 and Gizmo in 'Half-Baked Plan'

  [Duration 4:27, 36.3 MB]

  Mon, 05 Nov 2007 11:45:00 PST

  
  What makes the Earth livable? In this special animated cartoon, innocent alien M51 moves the Earth into a closer orbit around the sun, and learns an important lesson about life in the Universe.
  

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• What Happens When Galaxies Collide?

  [Duration 1:55, 15.1 MB]

  Fri, 14 Sep 2007 11:45:00 PDT

  (1 rating)
  Dr. Varoujan Gorjian takes us inside interacting galaxies.
  

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• What Is the Nearest Galaxy to the Milky Way?

  [Duration 2:34, 18.2 MB]

  Fri, 27 Jul 2007 14:15:00 PDT

  
  Dr. Michelle Thaller takes us into the murky answer to this not-so-simple question.
  

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• Why Isn't Pluto a Planet Any More?

  [Duration 3:31, 28.8 MB]

  Mon, 12 Feb 2007 16:15:00 PDT

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

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• How Can We See a Black Hole?

  [Duration 2:31, 18.9 MB]

  Thu, 24 Aug 2006 16:20:00 PDT

  
  If no light can escape from a black hole, how do we see them? Dr. Tom Jarrett answers.
  

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• What Is a Redshift?

  [Duration 2:28, 19.9 MB]

  Wed, 24 May 2006 15:30:00 PDT

  
  Dr. Tom Jarrett helps us understand this difficult scientific concept using a biplane, a flying saucer, and a cow.
  

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• Do the Stars Really Move?

  [Duration 2:52, 22.8 MB]

  Fri, 9 Dec 2005 18:00:00 PDT

  
  Dr. Steve Lord explains that the stars do move, but not in the way they appear to.
  

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• Why Do We See Spiral Arms in Some Galaxies?

  [Duration 1:54, 15.1 MB]

  Tue, 25 Oct 2005 15:00:00 PDT

  
  Dr. Steve Lord describes the processes that cause us to see spiral arms.
  

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• Are Other Solar Systems Like Our Own?

  [Duration 2:01, 14.0 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Davy Kirkpatrick explains the weird and wonderful solar systems we know about.
  

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• Do Other Solar Systems Exist?

  [Duration 2:08, 16.9 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Davy Kirkpatrick discusses extrasolar planets.
  

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• What Is a Brown Dwarf?

  [Duration 2:17, 16.0 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Davy Kirkpatrick explains the nature of one of the most unusual objects in space.
  

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• How Do Stars Live and Die?

  [Duration 2:25, 18.9 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Michelle Thaller explains the life cycle of stars.
  

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• Why Is Spitzer Painted Black?

  [Duration 1:34, 12.4 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Michelle Thaller explains the color scheme of the Spitzer Space Telescope.
  

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• Why Are Solar Eclipses Only Visible in Some Parts of the World?

  [Duration 2:25, 12.8 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Susan Stolovy answers the question of why only certain regions can see a solar eclipse.
  

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• What Causes an Eclipse of the Moon?

  [Duration 2:05, 15.5 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Doris Daou explains what causes eclipses.
  

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• Why Does the Moon Look Like It Changes?

  [Duration 2:10, 17.4 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Doris Daou answers a question about the phases of the moon.
  

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• Can You Feel a Solar Wind?

  [Duration 1:50, 14.6 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Dr. Robert Hurt answers a question about solar physics.
  

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• Why Doesn't the Moon Fall Down?

  [Duration 1:50, 12.2 MB]

  Fri, 14 Oct 2005 16:00:00 PDT

  
  Doris Daou answers a question about gravity and orbits.
  

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