Read the Transcript: http://to.pbs.org/fXnEDP
Perhaps you learned a mnemonic device such as the one above to help remember the planets -- Mercury, Venus, Earth, etc. -- and their order away from the sun. Turns out, we're going to need a longer mnemonic after the discovery of some 1,200 planets outside our solar system. Miles O'Brien discusses the findings with Jim Lehrer.
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