Unlike flat pictures of the sky taken from Earth, only a three-dimensional map can represent the actual shape and structure of the Universe—and our place in it. These resources explore the methods astronomers use to calculate the distances between Earth and celestial bodies, which our eyes along cannot judge.

		The 3-D Universe Article for grades 6 through 12 A 2-D map is a great guide here on Earth—and virtually worthless for finding your way around in outer space. Take a 3-D look at mapping our solar system and universe.
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		3-D Model of the Big Dipper Curriculum Materials for grades Kindergarten through 8 In outer space, you might not recognize the Big Dipper. The stars that form this constellation exist in 3-D not 2-D—so the star pattern changes with your viewpoint. Take another look at the Big Dipper.
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		Parallax Curriculum Materials for grades 9 through 12 When it comes to observing stars, our eyes have their limitations. Take a look at how astronomers combat these limits and accurately measure the distances between celestial bodies.
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