You hear distances all the time in astronomy. This star is 10 light-years away; that galaxy is 50 million light-years away; that Big Bang over there happened 13.7 billion years ago. But how did astronomers actually figure out how far away everything is? It’s not a single measuring stick. Instead, astronomers have built up a [...]

Published: Nov. 13, 2006 Download (14MB audio/mpeg)

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Astronomy Cast

Episode: Episode 10: Measuring Distance in the Universe

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