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New evidence found for Planet 9

phys.org

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Re: New evidence found for Planet 9

#31

Post by SAI_Peregrinus »

ben_w wrote: post #19
SAI_Peregrinus wrote: post #17

Earlier quoted context omitted.

Planet 9 should be Neptune. Mercury, Venus, Earth, Mars, Ceres, Jupiter, Saturn, Uranus, Neptune, Pluto, Orcus, Haumea, Makemake, Eris, etc. If you want Pluto back you have to take Charon as well! Don't discriminate, accept all the astronomical bodies in hydrostatic equilibrium orbiting the Sun!

What about Luna? The plutonic discourse aside, Earth-Moon is often described as a double-planet system.

The barycenter of the Earth-Luna system is (currently) entirely within the Earth. So Luna is a moon. Once it's outside the radius of Earth, then it'd be a double-planet system (or a double dwarf-planet system if that nomenclature lasts).

Re: New evidence found for Planet 9

#32

Post by jiggawatts »

ben_w wrote: post #22
playingalong wrote: post #16

Forgive my ignorance. If it's so relatively close, why wouldn't it be observed optically hiding some known objects? Mostly stars.

One of the options is that it's a primordial black hole, which leads to my favourite "actual size" caption on a diagram, page 5: https://arxiv.org/pdf/1909.11090

Nothing would be more exciting for theoretical physicists than a small black hole in the solar system. It would allow “immediate” access to direct experimental evidence of quantum gravitational phenomena that would otherwise require a round trip journey measured in tens of millennia.

Think about the funding this would unlock: long-duration deep space missions, particle accelerators in space, etc…

It would be a new renaissance for science.

Re: New evidence found for Planet 9

#34

Post by srhtftw »

ok_dad wrote: post #14
psunavy03 wrote: post #10

Earlier quoted context omitted.

Why will this stupid meme not die?

A ton of us grew up reciting Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune PLUTO But, the meme doesn’t die because the deplanetization of Pluto was a weird occurrence that doesn’t usually happen. The biggest association I have with Pluto is that it used to be a planet, so why wouldn’t I joke about that every time I see it mentioned?

Mary visits every monday, just stays until noon period.

Re: New evidence found for Planet 9

#35

Post by ok_dad »

db48x wrote: post #27
ok_dad wrote: post #14

Earlier quoted context omitted.

A ton of us grew up reciting Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune PLUTO But, the meme doesn’t die because the deplanetization of Pluto was a weird occurrence that doesn’t usually happen. The biggest association I have with Pluto is that it used to be a planet, so why wouldn’t I joke about that every time I see it mentioned?

Don't forget that Ceres, Pallas, Juno, and Vesta were once considered planets as well. Generations of schoolchildren memorized their names right alongside the others.

I’m not THAT old

Re: New evidence found for Planet 9

#36

Post by db48x »

ok_dad wrote: post #35
db48x wrote: post #27

Earlier quoted context omitted.

Don't forget that Ceres, Pallas, Juno, and Vesta were once considered planets as well. Generations of schoolchildren memorized their names right alongside the others.

I’m not THAT old

I didn't say that you were. I said that you should put yourself in the shoes of those older generations of students who memorized the names of the 11 planets. Or the 13, or 17, or dozens or however many had been discovered the year that their textbook was printed. Eventually they just gave up and started calling them all “the Asteroid Belt”.

If we had repeated history more closely, students would have memorized the names of the first few Kuiper Belt and Oort Cloud objects to be discovered. Repeat after me: Pluto, Albion (aka 1994 QB₁), 1993 SB, 1993 SC, 1994 GV₉, Arawn (aka 1994 JR₁), 1994 TB…

Or if you prefer to order them by size: Pluto, Eris, Haumea, Makemake, Gonggong, Quaoar, Ceres, Orcus, Sedna, Salacia, 2002 MS₄, 2002 AW₁₉₇, Varda, etc, etc.

Re: New evidence found for Planet 9

#38

Post by ok_dad »

db48x wrote: post #36
ok_dad wrote: post #35

Earlier quoted context omitted.

I’m not THAT old

I didn't say that you were. I said that you should put yourself in the shoes of those older generations of students who memorized the names of the 11 planets. Or the 13, or 17, or dozens or however many had been discovered the year that their textbook was printed. Eventually they just gave up and started calling them all “the Asteroid Belt”. If we had repeated history more closely, students would have memorized the n…

Sorry, was a joke, I didn't realize there were people taking this thread so seriously!
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