When Is a Planet Not a Planet?
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Description: Articles discusses the debate whether Pluto should be included among the planets. [Atlantic Monthly]
When Is a Planet Not a Planet? - David H. Freedman - The Atlantic The Science Behind 'Brain Training' Big Breakthroughs Come in Your 30s Arguments for and against demoting Pluto Pluto has been shrinking at an alarming rate for some time now. Well, not actually shrinking—rather, our awareness of how small Pluto is has been growing. Upon its discovery, in 1930, scientists trumpeted that Pluto was about as large as Earth. By the 1960s textbooks were listing it as having a diameter about half that of Earth. In 1978 astronomers discovered that Pluto has a relatively large moon, whose brightness had been mistakenly lumped in with the planet's; when this was taken into account, Pluto was left with a diameter about a sixth that of Earth, or less than half that of Mercury—long considered the runt of the solar system. Seven moons in the solar system are bigger than Pluto.
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| Page title: | When Is a Planet Not a Planet? - David H. Freedman - The Atlantic |
| Keywords: | The Atlantic, The Atlantic Magazine, TheAtlantic.com, Atlantic, news, opinion, breaking news, analysis, commentary, business, politics, culture, international, science, technology, national and life |
| Description: | Arguments for and against demoting Pluto |
| IP-address: | 68.232.35.229 |
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| Date | Creation Date: 15-aug-1995 Expiration Date: 14-aug-2014 |