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| Newly redesigned! Galactic census takers needed — no experience or door-knocking required. Easily use real astronomical data to uncover secrets of the universe, hidden in the HDF image. | | |
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| Follow our sweeping history of the telescope from Galileo's first look at the stars to the work of modern observatories. | | |
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| Discover the fierce force of gravity and pelt poor Jupiter with a comet! | | |
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| NASA needs your help in planning a Hubble Servicing Mission. Join the team! (Replaces "Astronaut Challenge.") | | |
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| Statistically speaking, this cosmic photo shoot is out of this world! | | |
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| Whip up a batch of comets — without trashing the kitchen! | | |
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| Great balls of fire … er, ice! Explore comet facts and fantasies through the ages. | | |
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| Galaxy construction timeline: billions of years. For you: ten minutes. | |
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| Take the plunge! Fall into one of our universe’s eeriest phenomena. | | |
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| UPDATED to reflect current science!
Keep the planets in your pocket. A fun card game tours our cosmic neighborhood. | | |
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| Catch the (light) wave! Find out how color can be more than meets the eye. |
