Ask an Astronomer

by NASA's Spitzer Science Center and Infrared Processing and Analysis Center
24

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

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Recent Episodes
  • Where Is the Center of the Universe? (Ask an Astronomer)
    Aug 26, 2009 –
  • W-5 Star-Forming Region (What Is It?)
    Feb 5, 2009 –
  • Why Is the Sky Blue? (Ask an Astronomer)
    Dec 22, 2008 –
  • What's Between the Stars? (Ask an Astronomer)
    Oct 23, 2008 –
  • Spitzer Turns Five (Ask an Astronomer Special)
    Aug 25, 2008 –
  • What Will Happen to the Earth When the Sun Dies?
    Jul 1, 2008 –
  • "Can a planet have two suns?" (Ask an Astronomer)
    May 8, 2008 –
  • "Can a galaxy die?" (Ask an Astronomer)
    Apr 10, 2008 –
  • "Why aren't there any green stars?" (Ask an Astronomer)
    Mar 13, 2008 –
  • "How do you discover an asteroid?" (Ask an Astronomer)
    Feb 13, 2008 –
  • Infrared: More Than Your Eyes Can See
    Dec 18, 2007 –
  • M51 and Gizmo in "Half-Baked Plan"
    Nov 5, 2007 –
  • "What happens when galaxies collide?" (Ask an Astronomer)
    Sep 14, 2007 –
  • "What is the nearest galaxy to the Milky Way?" (Ask Astron.)
    Jul 27, 2007 –
  • "Why isn't Pluto a planet anymore?" (Ask an Astronomer)
    Feb 12, 2007 –
  • "How can we see a black hole?" (Ask an Astronomer)
    Aug 24, 2006 –
  • "What is a redshift?" (Ask an Astronomer)
    May 24, 2006 –
  • "Do the stars really move?" (Ask an Astronomer)
    Dec 9, 2005 –
  • "Why do we see spiral arms in some galaxies?" (Ask an Astronomer)
    Oct 25, 2005 –
  • "Why are solar eclipses only visible in some places?" (AaA)
    Oct 14, 2005 –
  • "Why does the moon look like it changes?" (Ask an Astron.)
    Oct 14, 2005 –
  • "What causes an eclipse of the moon?" (Ask an Astronomer)
    Oct 14, 2005 –
  • How Do Stars Live and Die?
    Oct 14, 2005 –
  • "What is a brown dwarf?" (Ask an Astronomer)
    Oct 14, 2005 –
  • "Why is Spitzer painted black?" (Ask an Astronomer)
    Oct 14, 2005 –
  • "Can you feel a solar wind?" (Ask an Astronomer)
    Oct 14, 2005 –
  • "Are other solar systems like our own?" (Ask an Astronomer)
    Oct 14, 2005 –
  • "Do other solar systems exist?" (Ask an Astronomer)
    Oct 14, 2005 –
  • "Why doesn't the moon fall down?" (Ask an Astronomer)
    Oct 14, 2005 –
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