How many could there be?
Comment on Pluto is still a planet, just a dwarf one
mkwt@lemmy.world 1 day agoIf that happened, then school children would no longer be required to learn the names of all of the planets. That’s just a practical concern with adding another several dozen planets to the list.
And I think it is worthwhile to make kids learn the names and some basic facts about the 8 planets we have.
panda_abyss@lemmy.ca 1 day ago
mkwt@lemmy.world 1 day ago
Officially only 4 trans-Neptunian objects have been recognized as dwarf planets. But here’s a paper that proposes another 36 known objects to be dwarf planets.
That’s about what the situation was in 2006 as well. A new technology was worked out to make it easier to find these, and once it did a bunch of discoveries came in really fast. The writing was definitely on the wall.
If you include the entire Oort cloud, there could be billions of objects out there.
Deconceptualist@leminal.space 1 day ago
I thought dwarf planets still had to be round, and they just lack the “cleared its orbit” requirement (e.g. Ceres in the asteroid belt). That would disqualify any Oort cloud objects except Pluto and Charon as far as I know.
mkwt@lemmy.world 1 day ago
It’s true. Dwarf planets do have to be round ("in hydrostatic equilibrium"). That requirement will definitely disqualify many of the hypothetical billions of Oort cloud objects.
Ceres is an official dwarf planet, but I excluded it from my list because I was focusing on trans-Neptunians.
A big reason why the IAU hasn’t confirmed most of the 36 is because they want strong evidence of roundness, like a spacecraft flyby with direct imaging. Pluto and Eris are close enough that earth telescopes can just barely resolve some of their shapes.
Finally, Pluto and Charon are too close to be considered in the Oort cloud. Sedna, whose discovery precipitated a lot of this crisis, has been nominated as the very first discovered object in the “inner Oort cloud.” Sedna’s perihelion is at 76 AU.
panda_abyss@lemmy.ca 1 day ago
I think that’s so cool!
I wonder what they’re like (I’m sure the answer is cold and rocky, but still!)
We need more deities!
Whats_your_reasoning@lemmy.world 16 hours ago
nagaram@piefed.social 1 day ago
According to Plato we can just keep making them up. So I’m down!
My addition is Uupta goddess of warm fires and comforting foods. Put her wherever but I feel she’s close to the sun somehow.
Deconceptualist@leminal.space 1 day ago
Did you ever have to memorize the periodic table? This would be a walk in the park by comparison, at least using the current dwarf planet definition.
ParlimentOfDoom@piefed.zip 16 hours ago
It’s a grade school vs high school thing though. Also only our AP chem class has to memorize the entire table. Knowing the first 20-40 was sufficient for everyone else.