- Oct 16, 2015
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Welcome Back, Pluto? Planethood Debate Reignites
"The long-simmering argument about Pluto's planethood has just flared up again.
For more than 75 years after its 1930 discovery, Pluto was regarded as our solar system's ninth planet — a distant and frigid oddball, to be sure, but a member of Earth's immediate family nonetheless. Then, in 2006, the International Astronomical Union (IAU) reclassified Pluto as a "dwarf planet," a newly created category that the organization explicitly stressed made Pluto distinct from the eight "true" planets.
A true planet, according to the IAU's newly devised definition, must meet three criteria: It must circle the sun and no other object (so, moons are out); it must be big enough to be rounded into a sphere or spheroid by its own gravity, but not so large that its innards host the fusion reactions that power stars; and it must have "cleared its neighborhood" of other orbiting bodies."
It's not a huge thing science wise, but it's still interesting.
I know a certain poster on this website will get a hoot out of this.
"The long-simmering argument about Pluto's planethood has just flared up again.
For more than 75 years after its 1930 discovery, Pluto was regarded as our solar system's ninth planet — a distant and frigid oddball, to be sure, but a member of Earth's immediate family nonetheless. Then, in 2006, the International Astronomical Union (IAU) reclassified Pluto as a "dwarf planet," a newly created category that the organization explicitly stressed made Pluto distinct from the eight "true" planets.
A true planet, according to the IAU's newly devised definition, must meet three criteria: It must circle the sun and no other object (so, moons are out); it must be big enough to be rounded into a sphere or spheroid by its own gravity, but not so large that its innards host the fusion reactions that power stars; and it must have "cleared its neighborhood" of other orbiting bodies."
It's not a huge thing science wise, but it's still interesting.
I know a certain poster on this website will get a hoot out of this.