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Tags astronomy , pluto

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Old 8th September 2018, 01:13 AM   #1
Samson
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Pluto is was and always will be a planet

https://phys.org/news/2018-09-pluto-...ed-planet.html

Pluto pulled itself into a round shape, is geologically the second most complex solar orbiting object, and was most disgracefully red carded.

Thank you for this revising revisionism.
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Old 8th September 2018, 01:15 AM   #2
The Great Zaganza
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Fake Planet.
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Old 8th September 2018, 01:18 AM   #3
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I told you Niel Degrasse Tyson!

This is not as clear cut as Big Astronomy is trying to make it.
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Old 8th September 2018, 01:21 AM   #4
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'Disgracefully red carded'

People are way too much emotionally attached to a situation like this with Pluto.

Face it.
Whatever the criterium is for 'planet' status. The universe is big enough that there will be edge cases, which can mean they will fall on the planet side or the minor planet side of the equation, depending on how you look at it.
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Old 8th September 2018, 01:23 AM   #5
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Piss weak planet. If it was at the beach I would kick sand in its face.
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Old 8th September 2018, 01:33 AM   #6
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I always thought 'big enough to pull itself into a sphere' was the best and most obvious definition...
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Old 8th September 2018, 01:57 AM   #7
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Originally Posted by lionking View Post
Piss weak planet. If it was at the beach I would kick sand in its face.
Did you read the link? It is a fiery redhead, look at the picture.
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Old 8th September 2018, 02:03 AM   #8
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Originally Posted by lionking View Post
Piss weak planet. If it was at the beach I would kick sand in its face.
But Goofy would kick your butt.
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Old 8th September 2018, 02:05 AM   #9
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Old 8th September 2018, 02:11 AM   #10
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While this might be regarded as a fun thread, scientific input would be appreciated. I thought the relegation was a disgrace at the time, but New Horizon laid proof like an EGG.
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Old 8th September 2018, 02:12 AM   #11
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Originally Posted by Ethan Thane Athen View Post
I always thought 'big enough to pull itself into a sphere' was the best and most obvious definition...

So the Moon's a planet? Or did somebody/something else pull it into a sphere?
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Old 8th September 2018, 02:17 AM   #12
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Surely an object named after a minor Disney character cannot be taken serious with a claim to major planethood?!

(The should be an organization called "Panned Planethood", by the way )
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Old 8th September 2018, 02:49 AM   #13
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Originally Posted by dann View Post
So the Moon's a planet? Or did somebody/something else pull it into a sphere?
Does the moon orbit the sun?
Without a Ptolomeic eccentricity?
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Old 8th September 2018, 02:54 AM   #14
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Originally Posted by Samson View Post
Does the moon orbit the sun?
Without a Ptolomeic eccentricity?
No. It orbits the Earth - Moon barycentre.

.....and so does the Earth.
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Old 8th September 2018, 03:51 AM   #15
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I know, I know! My questions were an argument against the proposed definition of a planet. However, I wouldn't deny that big moons and small planets have many things in common, but their orbits are what distinguishes moons from planets.
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Old 8th September 2018, 05:06 AM   #16
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If we make Pluto a planet then we need to make many (read hundreds) of other bodies planets under the same definition.
I make a case that the moon is as much a planet as Earth. The Earth and Moon orbit each other and they together orbit the sun. This means that either both bodies are planets or neither are planets.
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Old 8th September 2018, 06:27 AM   #17
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Originally Posted by rjh01 View Post
If we make Pluto a planet then we need to make many (read hundreds) of other bodies planets under the same definition.
I make a case that the moon is as much a planet as Earth. The Earth and Moon orbit each other and they together orbit the sun. This means that either both bodies are planets or neither are planets.
No. You can classify the largest body in the co-orbiting group as the planet and the smaller ones as moons.
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Old 8th September 2018, 06:45 AM   #18
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Originally Posted by Oystein View Post
Surely an object named after a minor Disney character cannot be taken serious with a claim to major planethood?!

(The should be an organization called "Panned Planethood", by the way )
Pluto is far from a minor character, having had shorts built exclusively around his activities, thus elevating him from minor to secondary star status. I think the more important question is, how can Goofy, as an, anthropomorphic dog, have masterful dominance over Pluto, who is also a dog, albeit one with dominant canine tendencies, where in the Disney evolutionary chart did they deviate from one another? Virtually every other creature in that universe is ether anthropomorphic, or at the very least, fully sentient, save poor Pluto. What do they have against him?
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Old 8th September 2018, 07:36 AM   #19
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What a stupid idiot. The article is the scientific equivalent of "nuh-uh!" and any attention paid to it is more than it deserves.

The definition is completely arbitrary and everyone knows it. Pluto isn't a planet for the simple reason that we started finding a bunch of other Plutos. They're out there in the Kuiper belt just like Pluto is. Pluto's not even the most massive; that's Eris. There's also Sedna, Haumea, Makemake, Orcus, and lots of others. We've run out of mythological gods of the underworld to name them after.

Either the solar system has eight planets, or a couple of dozenish. Eight is cleaner. I'd also support dividing them into "Gas giant," "rocky body with atmosphere," and "rocky body without atmosphere," but dropping Pluto is necessary at a minimum.
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Old 8th September 2018, 07:37 AM   #20
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Originally Posted by lionking View Post
Piss weak planet. If it was at the beach I would kick sand in its face.
Pluto couldn't even kick the sand out of it's own orbit.
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Old 8th September 2018, 07:51 AM   #21
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Originally Posted by Ziggurat View Post
No. You can classify the largest body in the co-orbiting group as the planet and the smaller ones as moons.
Especially when the barycenter is inside the larger body.
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Old 8th September 2018, 08:00 AM   #22
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Originally Posted by phunk View Post
Especially when the barycenter is inside the larger body.
Which isn't the case for the Pluto/Charon system, IIRC.
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Old 8th September 2018, 08:06 AM   #23
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Originally Posted by Beelzebuddy View Post
Either the solar system has eight planets, or a couple of dozenish. Eight is cleaner.
And four is cleaner than eight, so why not say that only Jupiter, Saturn, Uranus and Neptune are true planets? There's a much cleaner dividing line between Neptune and Earth than there is between Mercury and Pluto.

Choosing your criteria just to reduce the number of planets is cowardly. Be brave. Choose a solar system with 20+ planets.
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Old 8th September 2018, 08:12 AM   #24
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Originally Posted by Trebuchet View Post
Which isn't the case for the Pluto/Charon system, IIRC.
It won't be the case with the earth forever either. The moon's orbital radius will eventually increase by roughly 40%, which should put the barycenter a bit outside the earth's surface. It would be strange for this gradual and smooth process to suddenly demote the earth from planet status.
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Old 8th September 2018, 08:15 AM   #25
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Originally Posted by abaddon View Post
Pluto couldn't even kick the sand out of it's own orbit.
Pluto has captured multiple moons, including one that's big enough for its gravity to form it into a spheroid. Obviously it's no Jupiter or even a Neptune, but then neither is Earth. Give it some credit here.
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Old 8th September 2018, 08:39 AM   #26
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It's my theory that the Solar System has little planets on the inside, big ones in the middle, and little ones on the outside.

That is my theory, it is mine and belongs to me, and I own it and what it is, too.

Also, it looks like a Brontosaurus.
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Old 8th September 2018, 08:40 AM   #27
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It's quite obvious to me that a dwarf planet like Pluto is no more a real planet than a dwarf human is a real human. They just don't have proper legs to stand on.
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Old 8th September 2018, 08:58 AM   #28
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I say we go back to seven planets: the Sun, the Moon, Mercury, Venus, Mars, Jupiter, and Saturn.
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Old 8th September 2018, 08:59 AM   #29
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Originally Posted by Ziggurat View Post
And four is cleaner than eight, so why not say that only Jupiter, Saturn, Uranus and Neptune are true planets? There's a much cleaner dividing line between Neptune and Earth than there is between Mercury and Pluto.
Did you read the next sentence? I'd be fine with further divisions. It would be a functionally more useful definition. Gas giants, planets (even if they're orbiting gas giants), rocky bodies. 0.1 kPa surface pressure is a good enough cutoff between the latter two. That would make Titan a planet, but not Mercury or Pluto.
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Old 8th September 2018, 09:18 AM   #30
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Has anyone asked Pluto what it thinks?
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Old 8th September 2018, 09:23 AM   #31
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Originally Posted by Beelzebuddy View Post
Did you read the next sentence? I'd be fine with further divisions.
Sure, but that should be subdivisions within the category of planets. The word has a history, and the current definition should have some relationship to that history. Mars and Jupiter should both be planets, because they have both been planets since the word was first used by the Greeks to describe celestial bodies. So the question is how far past Mars and Jupiter should that definition extend.

Picking your answer on the basis of the number of planets you want there to be in the solar system seems like a poor method.
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Old 8th September 2018, 09:26 AM   #32
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They should have left Pluto a planet with the explanation that it isn't technically a planet, but was grandfathered in since it had been considered a planet for so long.
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Old 8th September 2018, 10:26 AM   #33
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Originally Posted by Ziggurat View Post
Sure, but that should be subdivisions within the category of planets. The word has a history, and the current definition should have some relationship to that history.
That's why Pluto's new category is "dwarf planet."
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Old 8th September 2018, 11:24 AM   #34
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Originally Posted by Beelzebuddy View Post
That's why Pluto's new category is "dwarf planet."
But it isnít a subcategory, itís a separate category. And it shouldnít be.
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Old 8th September 2018, 12:04 PM   #35
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Old 8th September 2018, 12:30 PM   #36
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My definition of a planet: Earth.

The only other planets are whatever planetesque objects give earthlings pause, to contemplate the possibility that there are worlds beyond the their terrestrial horizon.
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Old 8th September 2018, 12:40 PM   #37
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Originally Posted by Oystein View Post
Surely an object named after a minor Disney character cannot be taken serious with a claim to major planethood?!

(The should be an organization called "Panned Planethood", by the way )
It also gave us "Plutonium" which we used to get to Pluto.

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Coinkydink! I don't think so!

What are you hiding, Pluto?! Are you hollow like the Earth?!
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Old 10th September 2018, 09:50 AM   #38
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Originally Posted by Samson View Post
https://phys.org/news/2018-09-pluto-...ed-planet.html

Pluto pulled itself into a round shape, is geologically the second most complex solar orbiting object, and was most disgracefully red carded.

Thank you for this revising revisionism.
So Ceres is a planet too?

Okay Samson
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Old 10th September 2018, 09:53 AM   #39
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Originally Posted by Dancing David View Post
So Ceres is a planet too?
Yeah that's what I don't get about the Pluto controversy.

We taken planets off "the list" before, everybody knows that right?
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Old 10th September 2018, 09:59 AM   #40
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But I learned Pluto is a planet back in school. So ..
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