Answer 1:
So, the general way to think of this is that an
object in motion will stay moving the same
direction (inertial force) unlessâ€‹ a force
is applied to it (applied force). So, for
an orbit, the diagram would look something like
this for a satellite around Earth example:
diagram 1
The inertial force is in a direction tangential to
the orbit. The applied force of gravity is
perpendicular to that, back toward Earth. The
resulting direction of movement is somewhere
between those two, and is the orbit
orbit .
So, you can think of an orbit more as falling in a
circle. The objects will orbit forever UNLESS
there are more forces at play. For example,
space very near to Earth is not a perfect vacuum
(although it is very close), so some of the
inertial force is slowly lost by essentially wind
resistance or friction in space, causing objects
in low earth orbit to slowly fall back to Earth as
the orbits decay. Therefore, the useful objects in
orbit are either replaced or "boosted back into
orbit" every now and then.
On Wikipedia, they discuss doing this for the
Hubble space telescope.
read here
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