Why closer? Gravity is a measure of acceleration, not force - replace the moon with an Earth-sized planet and it would accelerate towards us at exactly the same speed.

Of course, we'd accelerate towards it about 50x faster than towards the moon, which would rapidly destabilize things, but as long as we gave Earth a good strong sideways kick at the same time so they didn't collide on the first pass, the two should orbit their mutual center of mass, just as we currently do with the moon - even if that center is currently 1700km below Earth's surface. And over time tidal energy transfer would circularize the orbits, and tidally lock us to each other. Assuming we didn't give just the right kick to start with.

Is there a minimum stable distance for tidally locked binary planets?

They can't escape without one getting a huge outward kick of energy, and they can't collide without a huge inward kick. Tidal energy transfer is no longer happening, and I think you have to be pushing spiraling neutron star densities and speeds before you can shed much energy through gravitational waves. And so long as the sun is many orders of magnitude more massive, you're not going to get any pesky chaotically complex three-body problems cropping up. Just don't try to add a moon.

I suppose if they cross each other's Roche limit, where tidal stress will tear moons apart into rings, things might get complicated... but a quick search says that's only ~11,000km for Earth - a twin planet would actually be touching the surface before its center of mass crossed the line, but I think even such a "dumbbell planet" would still be stable so long as it wasn't spinning fast enough to throw stuff off the surface at the outer tips (you *know* that's where the spaceports would be!)

There’s no place to spend that kind of money in space!

I meant the L3 point, but I assume you are right and that it's not possible.

Keep in mind the moon is only ~1% the mass of the Earth, it's not doing much.

I would imagine the time to tidal locking decreases at *least* linearly with increasing gravity from the "lock-er" (e.g. twice the force = half the time, maybe less. That's normal for most systems), in which case if the moon were Earth-mass, 100x larger, Earth would lock to it 100x faster, and the 50 billion years until tidal locking (~55 with time served) would be closer to 550 million - almost before liquid water appeared on our surface.

I disagree. The bad eyesight the average person has now wouldn't of been such a hindrance they couldn't forage

I can see em pretty well in Yosemite. Love star gazing every time I go!

One of the few good traits of the species is that from time to time, we look up and wonder.

35 to 50 kya, as The Cosmic Hunt shows

Now days nobody can (in comparison to what a light pollution free sky looks like)

You could join spaceforce military…commit to 20 yrs?

"Grug, Thrug, sky charcoal make shape like crab! Me write on cave wall."

And the rest is history.

No because I can literally do nothing about the time I live and have too much crap going on in the present.

I can do it for half that amount with a 20 percent chance of coming back.

I’m a lifelong glasses wearer and had no idea. Thanks for sharing.

And 10,000 years is just for what we call civilizations, which is a tiny fraction of the time humans have actually existed. Apparently, there was a cave that was continuously inhabited by humans for 78,000 years! That's a scary amount of time to think about. History and pre history have nothing on our ancient history. And to think, all that time was observed in little chunks by so many people.

You can do that for $5. Ever tried DMT?

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Or it could be we as a species are already doing exactly that, and it’s all part of some deep black/off book classified space program, built from reverse engineered crashed UFOs propelled by electrogravitics, using some kind of portal/wormhole travel for great distances.

We’ve been visited for thousands of years. All over the world we find ancient evidence of visitors bringing knowledge from the stars arriving in flying craft. The UFO phenomenon is a tale as old as time. More and more the governments have hastened the drip of disclosure with acknowledging UAP programs like AATIP. They’ve begun the process of full disclosure, but on their terms.

I’m hoping that sooner rather then later, not only will the public get read-in on the special access programs congress is aware of , but the truth will come out about the deep black/off book projects, that could in theory be a thousand years more advanced then our conventional military. So maybe there’s a chance we’ll live to see the day we can see Jupiter in person or meet a visitor from the stars.

We also won’t be here when they begin to feast on us. I call that a win.

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no worries you wont miss a thing, we will destroy ourselves like every alien civilization did...
the age of the universe is 13.7 billion years, our ancestors have been around for about six million years !!!
so logicly what are the chances that we are the most advanced civilization ? probably close to zero...
so again logicly with all the time the universe existed where are those aliens?
they should be super duper ultra aliens civilization by now, we megastructures that colonize galaxys.
yet we see nothing.
every civilization destroy itself by science, there are fucking scientist that create black holes, and we know almost nothing about them !
who know what could happen ?!
not necessarily we get destroyed by that experiment, who knows...
its not my theory btw, its one of the many theories called Great Filter.

but yes, it is bothers me i guess...

Op, I would need 300k upfront for rocket costs. I will need a lot of foil and match heads.

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Actually, yes, it does.. how do you think we developed different human traits catering to the need of the regions they first emerged?