How big, how old, and how dense is the Universe?
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An exploration by Jeff Vogtschaller
University of Wisconsin, Madison For his Sauk County 4-H Astronomy Project |
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An exploration by Jeff Vogtschaller
University of Wisconsin, Madison For his Sauk County 4-H Astronomy Project |
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How do astronomers know how far away all those exotic stars and galaxies are, how can they tell there are planets around other stars, and how do we know the universe is expanding? The answer to these questions is all the same!
