Maybe that is why we havent been back, and the rest of hte misssions were :Faked"?
A bell rings because it has an opening at, at least one end. Then if the moon rang like a bell, then does it too, have an opening somewhere?
For 60 years geophysicists have suspected that the Earth's inner core was solid - now they have proved it.
By detecting special seismic tremors in the aftermath of a massive Indonesian earthquake, the seismologists from Northwestern University and the French Atomic Energy Commission have shown without doubt that at the heart of the Earth is a solid iron-nickel ball, 2400km in diameter.
The key to the breakthrough is the behaviour of the two types of seismic waves. Pulse waves can travel through both liquids and solids as they move by compressing and then relaxing the material in the direction of travel.
Shear waves, in contrast, can only pass through solids. They vibrate at right angles to the direction of travel and as liquids have no material strength the signal rapidly dissipates in the fluid.
So they then had to exploit the different speeds at which the waves travel. Imagine a seismic wave rumbling down through the Earth. When it reaches the outer core, all shear waves are lost and only pulse waves continue. When the pulse waves reach the inner core the waves are partly refracted and reflected.
This allows part of the energy to convert into shear waves that then travel through the inner core. Shear waves travel more slowly than pulse waves so they reach the opposite side of the inner core later. Here they are partly converted back to pulse waves.
It was these delayed pulse waves that the scientists detected.