Episode

Astronomy Cast

Wizzard Media

Science & Medicine, Natural Sciences

Chart Positions

Natural Sciences 14
Science & Medicine 36

Astronomy Cast brings you a weekly fact-based journey through the cosmos.

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Episode 10: Measuring Distance in the Universe

November 13th, 2006

Episode 10 of 465 episodes

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 series of overlapping measuring tools (yes, we're calling supernovae and variable stars tools), which take us from right around the corner to very ends of the Universe. Get out your ruler... no, the bigger one... never mind... just listen.

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