Astro Viz: Colliding Galaxies Article for grades 6 through 12 In three billion years, our Milky Way Galaxy will collide with its nearest neighbor, the Andromeda Galaxy. See how these two spiral galaxies are expected to merge, forming an elliptical galaxy.
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		Astro Viz: Extrasolar Planets Article for grades 6 through 12 Since 1995, astronomers have discovered more than 100 planets orbiting stars beyond our Sun—only a fraction of those thought to exist. Take an interactive tour of the Milky Way Galaxy to visit these "exoplanets."
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		Cosmic Chemistry Article for grades 3 through 12 What happened after the Big Bang? This comic strip explains the interactions that lead to the creation of stars, planetary nebulas, and supernovas.
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		Astro Snapshot Evidence and Analysis for grades 6 through 12 Don't miss the latest spectacular images from observatories around the world and in space. Visit our weekly Astro Snapshot for new sightings in our observable universe.
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		Vera Rubin and Dark Matter Article for grades 9 through 12 For every visible star in the observable universe, there are nine masses that are invisible and unidentified. Learn more about the astronomer who proved the existence of dark matter.
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		Galactic Census Curriculum Materials for grades 9 through 12 How many stars are there in our galaxy? How common are globular star clusters? How in the world would you go about finding answers to these questions? Learn the techniques astronomers use.
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