Quote:
Originally Posted by TheAstronomer
Pluto. It's a planet, then it's not. This week we review Pluto's history, from discovery to demotion by the International Astronomical Union. Learn the 3 characteristics that make up a planet, and why Pluto now fails to make the grade. ...
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It was a good show. But Pamela was incorrect when she was commenting on 'Dwarf Planet' Ceres (8:43 into the show).
Ceres has been classified as a Spheroid (in hydrostatic equilibrium) or it would not qualify as a 'Dwarf Planet'.
Ceres is not a (major) Planet because it has not "dominated the neighborhood around its orbit clearing it of comparable objects".
Asteroid Vesta fails as a 'Dwarf Planet' because it is not spherical.
I did enjoy listening to the show.
-- Kevin Heider