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Originally posted by Nick Nightstalker
... since we have no way of knowing exactly what earth would look like without the moon (it's always been there as long as recorded history is concerned, after all), ...
Originally posted by funny_pom
the moon cant be hollow, because it would have much less mass and therefore much less gravity. if this were so there wouldn't be any tides. besides, if it were hollow it would have been destroyed by meteorites by now.
[edit on 20-5-2007 by funny_pom]
Possibly the strongest evidence for it to be a 'hollow object' comes from the fact that when meteors strike the Moon, the latter rings like a bell. More specifically when the Apollo crew in November 20, 1969 released the lunar module, after returning to the orbiter, the module impact with the Moon caused their seismic equipment to register a continuous reverberation like a bell for more than an hour. The same effect occurred with Apollo 13's third stage which caused the Moon to ring for over three hours. So what's going on with the Moon?
It has been found that asteroids and meteors not only create shallow craters on the Moon's surface but produce a convex floor to the crater instead of concave as expected, supporting the idea of a rigid shell. Countless other pieces of evidence from astronomers and NASA scientists began to reveal that some 2-3 miles down there appear to be dense layers of metal -- which would explain why the craters were convex. But the most astonishing conclusion is that the only theory which can completely explain all the anomalies is that the Moon is hollow with a shell about 20 miles thick --mostly metal. Note that mascons (higher concentrations of mass) found in the marias cause fluctuations in gravity and have never been satisfactorily explained.
Unusually long reverberations were recorded from two lunar impacts by a seismic station installed on the lunar surface by the Apollo 12 astronauts. Seismic data from these impacts suggest that the lunar mare in the region of the Apollo 12 landing site consists of material with very low seismic velocities near the surface, with velocity increasing with depth to 5 to 6 kilometers per second (for compressional waves) at a depth of 20 kilometers.
www.sciencemag.org...
Direct shear-wave arrivals from seismtic events originating on the far side of the moon are not observed at some of the stations of the Apollo seismic network. These data suggest that the material in the lunar interior at a depth of 1000 to 1100 kilometers is more dissipative for seismic shear waves than the lithosphere above, and possibly exists in a partially molten state akin to the earth's asthenosphere.
Lunar seismic data from artificial impacts recorded at three Apollo seismometers are interpreted to determine the structure of the moon's interior to a depth of about 100 kilomneters. In the Fra Mauro region of Oceanus Procellarum, the moon has a layered crust 65 kilometers thick. The seismic velocities in the upper 25 kilometers are consistent with those in lunar basalts. Between 25 and 65 kilometers, the nearly constant velocity (6.8 kilometers per second) corresponds to velocities in gabbroic and anorthositic rocks. The apparent velocity is high (about 9 kilometers per second) in the lunar mantle immediately below the crust.
Originally posted by gimme_some_truth
In your image link it says 366/100=0.27322, well, It DOESNT
366/100=3.66
[edit on 14-3-2009 by gimme_some_truth]
Originally posted by gimme_some_truth
then you say that the circumfence of the earth times the moon divided by 100 equals the circumfrence of the sun?
Well, The circumfrence of the sun is4,366,813 km. Earth has a circumfrence of 40,075.16 and the moon 10,864 km
So 40,075.16x10,864/100=4353765.3824 km
It does NOT equal 4,366,813 km
Finally you have 39,988x10,920/100=4366689.6km
Well it actually equals 436668960 km NOT 4366689.6km
[edit on 14-3-2009 by gimme_some_truth]
Originally posted by djusdjus
There is really nothing to substantiate a hollow moon.
At 7:21 p.m. Tuesday, the spacecraft swung behind the Moon, lost contact with Earth and passed 164 miles above the lunar surface. Haise and Swigert, who had never been so close and might never get closer, snapped photos like a couple of tourists. At 7:49 the spacecraft emerged on the other side and was again picked up by tracking stations. This conversation took place: SC--Houston, Aquarius. CAPCOM--Aquarius, Houston. SC--The view out there is fantastic... You can see where we're zooming off. Apollo 13 was headed homeward. Moments later the 15-ton spent third stage of the Saturn V launch vehicle crashed into the Moon, as planned. It occurred at 8:09 p.m. EST, April 14. The S-IVB struck the Moon with a force equivalent to 11 1/2 tons of TNT. It hit 85 miles west northwest of the site where the Apollo 12 astronauts had set up their seismometer. Scientists on Earth said, "the Moon rang like a bell." Back in November 1969, the Apollo 12 astronauts had sent their Lunar Module crash- ing into the Moon following their return to the command craft after the lunar landing mission. That Lunar Module struck with a force of one ton of TNT. The shock waves built up to a peak in eight minutes and con- tinued for nearly an hour. The seismic signals produced by the impact of s-IVB were 20 to 30 times greater and four times longer than those resulting from the LM crash. Peak intensity occurred in 7 minutes. The information from these two artificial moonquakes led to reconsideration of theories proposed about the lunar interior. Among puzzling features are the rapid build- up to the peak and the prolonged reverbera- tions. Nothing comparable happens when objects strike Earth. One theory is that the signal is scattered and repropagated in very deep rubble. An- other holds that the velocities of seismic waves from these impacts are comparable to meas- urements of velocities in crystalline rock. So the crystalline material which the astronauts found so abundant on the Moon's surface may extend very deep into the Moon. Houston reported the lunar impact of the S-IVB to the spacecraft: