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G=EMC^2 Glazier wrote:
On the Earth's surface gravity is the strongest. Strongest as
measured by objects not sitting on the earth's surface? Go figure
Bert

not sure what your driving at G, but i've been wondering.....

How does gravity change below the surface of the earth? In outer
space, a person is weightless or zero G's, on earth's surface gravity
is 1 G. I assume somewhere like 50 or 100 miles up, its like 1/2 G.
(1) say you dig a hole down toward the center of the earth and weigh
yourself 2,000 miles down. Do you weigh more or less? It seems you
would
weigh less as a good portion of earths mass is now above you and that
much less is below you.
(2) say you hollow out 1 mile diameter spherical cavity in the center
of the earth, would you float to the center of this cavity and be
suspended in "midair"? And, if so, would you again be weightless? and
would you be able to walk around "upside down" on the surface of this
hollowed out sphere?
You seem to think that astronauts are 'weightless'. They are not.
A person in Orbit, is _not_ weightless. This is a common 'misnaming' of
what is going on. They are in 'free fall'. The satellite, and them, are
both falling towards the Earth with the same acceleration. It is just that
they effectively 'fall and miss' all the time. Remember the Moon is being
held in it's orbit by the Earth's gravity.
Now your question about a hollow in the centre of the Earth, would not
work, because of the Moon. The actual centre of mass of the Earth-Moon
system, is moving all the time as the Moon orbits, and also moving as the
Earth orbits the Sun. However on a imaginary planet, without a Moon, or
Sun, you would experience no gravitational acceleration at the centre of
the sphere.

Best Wishes