Farside buildings

[Pimander]

Mare Orientale.  It is over 900 km (560 miles) but the Moon itself only has a diameter of 3476 km (2160 miles).

Mare Orientale's diameter is a quarter that of the Moon!  How big would a meteor causing a crater that big be?  How much energy would the impact have?

[Sgt.Rocknroll]

here's the official defenition.

The mare is about 900 kilometres (560 mi) across and was formed by the impact of an asteroid-sized object. Unlike most other basins on the Moon, Orientale is relatively unflooded by mare basalts, exposing much of the basin structure to view; the central portion of Mare Orientale is covered by a thin layer of mare basalt probably less than 1 kilometer deep, much less than in other nearside mare basins. The collision caused ripples in the lunar crust, resulting in the three concentric circular features. The innermost rings of this vast, multi-ringed crater are the inner and outer Montes Rook, and the outermost ring are the Montes Cordillera, 930 km in diameter. Basin ejecta begins just outside the Montes Cordillera and extends up to 500 kilometers beyond the base of the mountains. This ejecta has a rough, hummocky texture and contains linear patterns that point back toward the center of Mare Orientale.
Material from Mare Orientale was not sampled by the Apollo program so the basin's precise age is not known. However, it may be the freshest impact basin on the Moon and is believed to be slightly younger than the Imbrium Basin, which formed about 3.85 billion years ago. The surrounding basin material is of the Lower Imbrian epoch with the mare material being of the Upper Imbrian epoch.

it's a crater.

[Pimander]

List of largest craters in the Solar System

Some of the craters on the Moon and Mars look unbelievably big to me. Surely they would not have survived these impacts?  I haven't looked at the physics of them but my initial reaction is that the Moon and Mars would not survive the impacts.... 

Unless they aren't craters caused by meteors.

[Amaterasu]

I agree, Pim.  That much energy should have smithereened the hit body, I would think.  I also find it...interesting that so many of the moons of Saturn have a "death star" look to them...

Hmmmm.

[andolin]

List of largest craters in the Solar System

Some of the craters on the Moon and Mars look unbelievably big to me. Surely they would not have survived these impacts?  I haven't looked at the physics of them but my initial reaction is that the Moon and Mars would not survive the impacts.... 

Unless they aren't craters caused by meteors.

So if the moon is a semi-hollow construct...towed into place...When were the craters put there??? 

[Pimander]

So if the moon is a semi-hollow construct...towed into place...When were the craters put there???

I don't think it is completely hollow at all.  It may be less dense than Earth and have hollow parts but I doubt it is completely hollow.  I'm not sure whether John Lear would agree with me though.

As for the craters, which ones are you referring to?  The smaller ones or the massive ones that are a fifth or more Mars' or The Moon's diameter?  I think the smaller ones were caused partly by the conventional meteors and possibly partly by massive electrical discharges in the past.  The huge ones, I'm looking for answers too....

You'll have to ask John about towing the Moon.  I don't understand that theory yet and haven't read the work John referred to earlier in the thread.

[andolin]

I don't think it is completely hollow at all.  It may be less dense than Earth and have hollow parts but I doubt it is completely hollow.  I'm not sure whether John Lear would agree with me though.

As for the craters, which ones are you referring to?  The smaller ones or the massive ones that are a fifth or more Mars' or The Moon's diameter?  I think the smaller ones were caused partly by the conventional meteors and possibly partly by massive electrical discharges in the past.  The huge ones, I'm looking for answers too....

You'll have to ask John about towing the Moon.  I don't understand that theory yet and haven't read the work John referred to earlier in the thread.

Yah...i was pointing this at JL, That big crater impact should have moved it into or out of orbit (earth).....I mean't semi-hollow....implying that some underlying structure bent but did not break.....Implies a structure with some outer shell of some resilience....

[Sgt.Rocknroll]

The following is from 'Anomaluna' from Viewzone magazine:




'Moon is, apparently, a terraformed, engineered piece of hardware, with an outer layer of dust and rock, and beneath this 3-mile layer, a solid 20-mile thick shell made from highly resistant materials like Titanium. Uranium 236, Mica, Neptumium 237. Not what you would expect.

No meteorite can really smash it to pieces. Moon seems to have been towed into place through space. Without it, there would be no life on Earth as it would be a sterile habitat. Now let's not take it too personally, it was probably not placed where it is just for us, but for Terra as such. We just happen to look at it and wonder, at least some of us.'

Just something I believe..

Peace
Rock

[Amaterasu]

I believe it is very close to the truth, Sgt, if not spot on.  The moon is a Being fabrication and not a natural satellite.

[ArMaP]

Some of the craters on the Moon and Mars look unbelievably big to me. Surely they would not have survived these impacts?  I haven't looked at the physics of them but my initial reaction is that the Moon and Mars would not survive the impacts.... 

From my playing with the impact calculator, it looks like a planet needs an impact of an almost equal sized object to be completely destroyed.

Let my try something.
A 50 km wide piece of mostly iron, hitting Earth at 72 km/s and at an angle of 90º, would result in:

Major Global Changes:
The Earth is not strongly disturbed by the impact and loses negligible mass.
The impact does not make a noticeable change in the tilt of Earth's axis (< 5 hundreths of a degree).
The impact does not shift the Earth's orbit noticeably.

Crater Dimensions:
Transient Crater Diameter: 637 km ( = 395 miles )
Transient Crater Depth: 225 km ( = 140 miles )
Final Crater Diameter: 1480 km ( = 920 miles )
Final Crater Depth: 2.66 km ( = 1.65 miles )
The crater formed is a complex crater.
The volume of the target melted or vaporized is 1.21e+07 km3 = 2.9e+06 miles3
Roughly half the melt remains in the crater, where its average thickness is 37.9 km ( = 23.6 miles ).


Planets are resistant.

Source: Earth Impact Effects Program

[Pimander]

Surely the effects on Earth's rotation will depend on the angle of impact as well?  It could also change the diurnal rotation....

I need to take a look at the physics of the impacts for myself before I make up my mind.

It could just be the death star weapon hidden under dust.   

[johnlear]

Our moon was fabricated inside Jupiter 38 billlion years ago. It has been towed around serving the same purpose for other earths as it does for us and that is to provide underground labs for the grays to do their check ups on humans.

The moon is not and cannot be hollow. Like earth and every other planet it has huge underground caverns that are located several miles underground. These caverns are constructed into hi tech labs for the grays.

Most of the markings around Orientale are due to the method that the EMV (Electro Magnetic Vehicle) used to tow it here and there during the past 38 billion years.

[Sgt.Rocknroll]

No John we haven't. This isn't one of the several you sent me. I don't think I've seen this one before.
Waiting on the file info my friend.
Good to hear from you BTW.

Rock

John, any info on this file so I can find a better copy?

[johnlear]

I came across this photo in the Moon As Viewed by Lunar Orbiter on page 102 and it didn't look like much. I was about to turn the page and I noticed something interesting. Then something else. After I marked about 5  places I realized the whole darn thing was full of interesting spots. Take a look Rock and see if you see anything.



Below are 2 different charts of the farside and where my photo is taken. The coordinates are  8 N  113 W, and are shown as a blue rectangle.

[hoss58]

I know this isn't a farside building but I wanted John to see this video so I put it here since he has been posting on this thread .

http://www.youtube.com/watch?v=CtyFQRkhW9g&feature=player_embedded