Friday, June 2, 2017

The Density of Earth

It is generally believed that our planet has a super-dense core,

This springs from the fact that gravity measured at the surface of our planet is very strong, and a strong gravitational field implies dense matter, assuming Newton was right about gravity being mass attracting mass.

Rocks and minerals found at the surface of our planet are not dense enough to account for the gravitational field, so the assumption is that there must be a lot of denser stuff deeper down. This makes sense because heavy stuff sink into lighter stuff. However, there is a problem with this idea, and that is the fact that there is no net gravity at the center of our planet. There is no reason for dense stuff to accumulate in the center of our planet. In fact, the opposite seems more likely.

In the absence of gravity, the centripetal force of our rotating planet becomes dominant in the region close to the center of our planet. This means that dense stuff is pushed outwards in this area. Using Newton's theory of gravity, we are more likely to find a gas filled hollow at the center of our planet than a super-dense core. Yet we require a super-dense core in order to explain the gravitational force. Density has to increase all the way down.

However, using the capacitor model of gravity, no super-dense core is required. The capacitor model does not require an increase in density all the way to the core, nor does it predict it, The capacitor model predicts that the densest stuff will be found roughly half way between the inner and outer surface of our hollow planet. It predicts a substantially less dense planet.

This in turn, has significant implications when it comes to how seismic data is to be interpreted. Sound waves travel slower in a less dense medium. That means that earthquakes that appear to be happening at depths up to 700 km, are in fact happening closer to the surface. It also means that seismic waves do not travel through the core of our planet, but around the perimeter. It means that Jan Lamprecht was right in his interpretation of seismic data.

Cross section of a hollow planet
Cross section of a hollow planet


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