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The Great Debate over whether the universe is small or large

The visible universe is vast. It is 93 billion light years across, and contains more than 100 billion galaxies. The average galaxy contains about 100 billion stars, and untold numbers of planets. Yet a century ago there was serious doubt among many astronomers that the universe was much more than 100,000 light years across. Arguments about whether the universe was small or large became known as the Great Debate.

read more The Great Debate over whether the universe is small or large.

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This entry was posted on September 19, 2014 by in Astronomy.

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