this post was submitted on 27 Dec 2024
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[–] [email protected] 1 points 3 days ago

There's also an argument that the moon isn't actually a moon since it doesn't actually orbit around the Earth. If you look at their respective orbits, the moon and Earth kind of shift places like a spinning helix pattern and the orbit of the moon is more tied to the sun than the Earth.

I haven't watched this all the way through, but it looks to largely cover the same material. I don't know how common this is among moons, but I think it makes Earth's relationship with its moon that much more special.

[–] kerrigan778 3 points 6 days ago (1 children)

Our moon is only the largest moon to planet ratio in our solar system if you discount Pluto as a planet.

[–] [email protected] 1 points 6 days ago (1 children)

Fun fact: if Luna was only about 30% heavier than it is currently, the Earth's barycenter would lie outside of Earth, which would potentially make Earth not count as a planet by the modern IAU definition.

[–] kerrigan778 1 points 6 days ago

The real question is... Could such a situation be inhabitable, could life evolve on such a world?

[–] [email protected] 92 points 1 week ago (3 children)

Yeah I think the impact that created the moon is the main reason why there's life on this planet. That impact also mixed up the heavier metals and liberated enough phosphorus making the composition of earth's crust unique. Also the two metal cores fused and made it oversized, prompting the difference between the rotation of the Earth and the core, making the magnetic field that protects our atmosphere possible...

So yeah, I'm definitely not optimistic about life on different planets....

[–] [email protected] 31 points 1 week ago (1 children)

But hey, if it happened once, maybe we'll get to find some remains of another system to which this happened as well. Or maybe, someday, someone else will find ours. Or perhaps gravity is the only force keeping us from drifting off the surface of our rock, preventing us from falling into the darkest void for eternity, with the vain hope that your frozen corpse will someday land in someone else's yard, like a cosmic frisbee.

[–] lunarul 24 points 1 week ago (1 children)

The universe is large enough that similar combinations of events could have happened elsewhere too. But it's also large enough that those places are most likely further from us than our species will ever travel.

[–] [email protected] 6 points 1 week ago (1 children)

Perhaps too far to ever travel, but if we can detect it to at least be aware of their existence, then that might be enough for us. Just an answer.

[–] [email protected] 1 points 3 days ago

Honestly, if we ever got a really credible answer, I'm sure we'd dramatically increase the pace of space travel research, to the point where we might innovate a way to get there. Maybe we do one of the space/time bending options, or maybe we find a way to punch a hole through spacetime or something like that. If there's a will, we'll put a ton of resources into exhausting every potential way to do it before giving up. It might even create multi-national unity in a way that we've never thought possible.

So please, if you're an alien that's been quietly listening to our broadcasts, please send an answer somehow.

[–] Tarquinn2049 8 points 1 week ago (3 children)

And I'm sure the strong tidal pull likely had an accelerating effect on the early stages of the emergence of life, since the first steps would have basically had to crash into each other in water without having any other way to move. There are many other ways for that to happen on the "millions of years" time scale, but the amount the moon moves our water has got to have had a notable effect.

[–] [email protected] 7 points 1 week ago

Earth is and always has been the giant beaker of chemicals that has one of those magnetic stirrers in it, thanks to the moon.

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[–] Semi_Hemi_Demigod 76 points 1 week ago (2 children)

In the fifth or sixth book of the Foundation series they follow a map to Earth that mentions a planet with huge rings and a planet circled by a giant moon. Throughout the universe, this combination was so unique you could identify the home of humanity among trillions of planets.

It's a weird book but I'm glad I read it.

[–] [email protected] 21 points 1 week ago (1 children)

Well, Foundation and Earth is the fifth book of the Foundation trilogy... of course it's weird.

[–] toynbee 9 points 1 week ago (8 children)

Similar to the five book Hitchhiker's Guide trilogy.

[–] [email protected] 8 points 1 week ago

Yeah, but the Foundation trilogy has seven books.
The last two being prequels.

(Also it's connected to the Galactic Empire trilogy, which does have three books, but was published in reverse order, and the Robot series, a four book duology not to be confused with Asimov's other robot books, though it's set in the same universe, and also to The End of Eternity, which is set in a different timeline altogether but is sort of a prequel to the whole shebang.)

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[–] lunarul 9 points 1 week ago (1 children)

And the idea of such a big moon was part of why it was largely thought of as an unfounded myth.

[–] [email protected] 6 points 1 week ago (1 children)

And it shows how Asimov had zero conception of how ridiculously huge the galaxy is, though that's just the storylines being a product of their time, probably.

[–] [email protected] 10 points 1 week ago (1 children)

Or he was writing a fiction and knew he could play fast and loose with scientific laws.

Asimov wrote non-fiction books about astronomy; I'm sure he knew as much about it as you do.

[–] [email protected] 7 points 1 week ago (2 children)

Nah, I read the whole series recently and for some details that bothered me looked up the how the science on that progressed. I can't give you exact examples as I don't remember details, but I do know that there's a bunch of very mistaken assumptions that the series is built on that he had no way of knowing back when he started and had to keep going forward (remember, the series was written over several decades starting in the fourties) and also a bunch of errors where he could have known better but just messed up.

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[–] [email protected] 68 points 1 week ago (9 children)

Well technically Charon is bigger relative to its parent body but, y'know, Pluto isn't a planet...

[–] [email protected] 39 points 1 week ago* (last edited 1 week ago) (2 children)
[–] Balthazar 15 points 1 week ago
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[–] [email protected] 34 points 1 week ago (1 children)

A-ha! So the real reason Pluto got degraded was so Earth could keep it's biggest moon status!

[–] [email protected] 25 points 1 week ago (1 children)

Big Moon has gotta be behind this!

[–] Strobelt 14 points 1 week ago

Always making waves...

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[–] [email protected] 28 points 1 week ago (1 children)

Due to tidal effects the moon is slowly getting further away from the earth, so we're living at just the right time to see such spectacular eclipses

[–] AngryCommieKender 18 points 1 week ago (1 children)

Just add some really massive thrusters to the Artemis 3 payload manifest and nudge it back every so often

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[–] homesweethomeMrL 16 points 1 week ago (1 children)

The Whack theory still has some important exceptions, which is why there’s a Double-Whack theory, which also has exceptions.

“The moon was created this way” is an opinion.

[–] [email protected] 23 points 1 week ago (1 children)

"hypothesis", rather than "opinion", no?

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[–] [email protected] 15 points 1 week ago (1 children)

So evangelion was right?

Jokes aside, the probability of moonlike-moons forming in earthlike-planets should be added to drake's equation and see what that begets.

Might explain a lot of the silence, at least for life as we know it

[–] NocturnalMorning 16 points 1 week ago* (last edited 1 week ago) (3 children)

The drake equation is a bogus probability that really means ultimately nothing. I wouldn't put stock in anything it says.

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[–] [email protected] 12 points 1 week ago (1 children)

But the moon size thing isn’t a coincidence, thats part of what makes solar eclipses so rare, the moon needs to be at the correct distance when it passes in front of the sun or it isn’t as impressive, and it does do that some times.

[–] AngryCommieKender 15 points 1 week ago (4 children)

Total* solar eclipses. Mars has solar eclipses, just not very impressive ones since the shadows are so small, but you could actually look directly at the sun to see the shadow at that distance, without fucking up your eyes

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[–] [email protected] 12 points 1 week ago
[–] [email protected] 10 points 1 week ago (2 children)

There are some schools of thought that say that a large moon like ours should be a part of the Drake Equation, because without which life would have a very hard time even on supposed “garden planets”.

Another factor that is likely to affect civilizations is an easy source of energy, like oil. We got lucky, in that the evolutionary development in Lignin in plants - and the several million years needed for bacteria to catch up and be able to break it down - are what created those massive deposits of organic matter that became trapped deep in the Earth and modified into oil. Without that oil we are unlikely to have reached several milestones, including transportation, population levels, trade, high technology, and even access to space. And this would start affecting us several hundred years back, with steam engines.

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[–] ChickenLadyLovesLife 7 points 1 week ago

I like to imagine an alien "watcher" with a lifespan measured in billions of years who has been hanging out in our solar system since its formation. It finally decides to contact us humans and tells us that it saw our moon being formed from another planet smashing into Earth billions of years ago. "Yeah, we know - wanna see the movie we created showing it?"

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