Hurrdurr the moon wouldn't be any different if it was hollow from the begining. So all you idiots saying "OH WE WOULD KNOW IF IT WAS HOLLOW CUS ITD BE DIFFERENT FROM WHAT IT WAS HURRDURR" if it was always hollow wtf is going to be different?

Anyways it'd be cool if it was some sort of alien life space ship thinga majig, but I doubt it. I'll just wait and see though and stop giving a fuck for now.

The idea is that the moon has always been hollow/a spaceship (or at least was before we came to be and notice tides etc). Therefore the tides as we know them are as they are because of the mass of the hollow moon.
And so we'd see a change in tides if the moon became solid to the core.

Yes it's been said before earlier.

And as far as random theories go about moons, this theory could be compared to the theory that the moons of Phobos and Deimos have demons inhabiting them that will come out and eat us when we settle there and develop teleportation technology. (i.e. "it sounds ridiculous but prove us wrong ha ha ha")

Well it's not hard to insinuate that other life forms don't exist on our moon, on a similar issue, the proteins needed to create life can only be arranged by a particular formation of compounds, the probability of these atoms forming together is so low, you would need a 100 trillion planets for the theoretical odds of one planet forming single celled organisms. Luckily, there's probably a googplex of galaxies, if not an infinite number of galaxies, but the chances that another formation of life occured on another planet and had evolved to travel to Earth, to investigate Earth, to watch Earth is practically impossible.

Practically impossible is an understatement.


Personally, I have to debunk this theory.

Practically impossible unless one of the "1 in a 100 trillion" planets just so happened to be in the same galaxy, no?
Ah the possibilities...

All the things I said needed citations, the numbers aren't the point. All that matters is, that there is a minute chance of a planet which contains life, but, since the universe contains a seemingly infinite number of planets, chances are there are probably more planets with life than we can count out there. Unfortunately, this does not guarantee at all that there is life in this Galaxy.

But that's not even why I debunk this theory. We've been in contact with the moon for a while. I'm sure if it was hollow we would have figured it out by now. If it was hollow, there would obviously be some huge impact on the orbit around our Earth. You're talking about millions of tons just empty inside the Moon. Secondly, what civilization can maintain themselves on a barren moon without giving any news to our many telescopes and satellites studying the moon.

A moon-base is simply just irrational.

This is a retarded concept honestly, which can be easily disproved by a simple fact:

After the impact with Earth, millions of years ago, the Moon was left in one piece. If it was hollow, it would have been space dust by now. ( and if it was a spaceship, I think it had enough time to steer away from Earth unless the driver/s was/were drunk/high)

Do you even have the slightest clue how masses of moons/planets are determined? If you don't I suggest you look into that, this doesn't make you look a lot smarter.

http://www.mathpages.com/home/kmath469.htm

Maybe this helps. If the moon would have a different mass, the distance or its angular velocity would be bigger. It doesn't matter at all how long it has been this way, just the mass and with that the distance or the angular velocity would be different. And if you see a pretty huge moon with a very small mass, it gets obvious somethings off.
Also, don't start with the "the shell would be dense". If it would be dense, the angular momentum would be way off.

Well, if the moon had less mass we probably wouldn't have had life on Earth as well ^^

Measured density of Moon: 3.344 g/cm^3

Assuming the moon was a hollow sphere with 50 miles of surface (a nearly impossible megastructure), compared to a solid moon which is 1079 miles in radius. Assuming uniform distribution of materials, the moon would need to be 7.53 times denser to retain the same physical properties. This puts the material that it would be made out of at 25 g/cm^3.

Which is about 3g/cm^3 higher than iridium, which would make it the heaviest nondegenerate stable matter we that know of. The structural strength of this unobtanium would need to be incredible as well. Very large objects with significant gravity have a tendency to collapse on themselves. We know the surface gravity of the moon to be 1.624 m/s^2, which means that a 1 kilogram weight on its surface will exert 1.624 N. Let's take the outermost layer of this sphere, the first mile of our 200 mile thick surface. Turns out to mass more than the Earth's oceans put together. (Admittedly, the actual weight is a bit lower). Consider that the Earth's oceans are 3 or 4 miles deep on average, and that they cover most of the planet. Now consider that this is just 1 mile of material in our shell. The mechanical requirements here are beyond my ability to calculate, but I can assure you that it's quite implausible that the material unobtanium even exists, and that it can also withstand its own weight. Steel can't, after all.

Furthermore, yes, rotational inertia can be applied to this to say that even if it is hollow then it must be much less hollow which means that unobtanium is much less dense and thus probably much weaker structurally (density and strength are at least loosely related) and would be even more prone to collapsing.

A side note: As far as the universe cares, we are insignificant yet surprisingly arrogant little apes. We are, as far as we know, in no way special. The probabilities that more advanced alien life exists out there are staggeringly high, the fact that we haven't encountered them yet is merely a testament to "Space is big". The chance that they care about us in particular, on the other hand, is staggeringly low. What if they're Tyranids? Scary thought.

Obviously if moon people that made that giant moon space station death star wanted to live on it, they wouldn't hallow it out completely like you're saying. It'd be partially hallow, but moon men still need walls and privacy and etc. If they're some advanced civilization they probably already know how to do w/e so that it stays how it is. Also, so say they make the shell really dense they use their invisible thruster technology to keep the moon how it is, and seemingly normal to us puny earthlings.