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how is Pluto not a planet
Question
Asked 2/28/2011 6:41:28 PM
Updated 1/10/2016 11:59:34 AM
1 Answer/Comment
Edited by Janet17 [1/10/2016 11:59:27 AM], Flagged by Janet17 [1/10/2016 11:59:34 AM]
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User: how is Pluto not a planet

User: what happened in 1838

Question
Asked 2/28/2011 6:41:28 PM
Updated 1/10/2016 11:59:34 AM
1 Answer/Comment
Edited by Janet17 [1/10/2016 11:59:27 AM], Flagged by Janet17 [1/10/2016 11:59:34 AM]
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In August 2006 the International Astronomical Union decided that Pluto's status should be downgraded from "planet" to "dwarf planet", because it fails to meet IAU's third criterion for a full-sized planet:
(1) It is in orbit around the Sun. Check.
(2) It has sufficient mass to assume hydrostatic equilibrium (a nearly round shape). Check.
(3) It has "cleared the neighborhood" around its orbit. Fail - Pluto is not massive enough to have sufficient gravitational pull to attract neighboring bodies into orbit around it, and continues simply to share its orbit with Kuiper belt objects such as the plutinos.

Added 1/10/2016 11:57:33 AM
This answer has been confirmed as correct and helpful.
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