what makes a satellite fall back to earth?

Question

need helo for science quick

Answer 1

Friction with the thin upper atmosphere. The atmosphere does not just end at 100km or any other altitude. It just gets thinner and thinner the higher you go. At 300km up, there is still enough air to cause a microscopic drag force. This gradually slows the satellite causing it to drop lower, where the air is thicker causing even more drag. This is only a problem in low orbits. Satellites in high orbits, over 1,000 km high or so, never really fall out of orbit.

Answer 2

Once the forward momentum of the satellite has expired the planets gravity takes over and pulls the object down.

Answer 3

There's enough air even at 300 miles to slow it down. Low orbit spy satellites and the space station have to reboost to higher orbits now and then because the atmosphere drags them down.

Answer 4

Over time a satellite will fall to earth from the constaint pull of the earths gravity.

Answer 5

1-because of the molecules and photons which hit the satellite
and give the satellite some momentum
2- because of the acceleration which the moon and the sun inflict
with the above reasons the satellite's orbit changes and if it doesnt gets correct it will fall sooner.

Answer 6

Well, China fired a missile and fall back a satelite to earth. hehe...

Answer 7

The drag of air molecules over time slows it to less than orbital velocity.

Answer 8

The force of gravity that the earth exerts on the satelite

Answer 9

Also the drag of the atmosphere as it enters it

Answer 10

gravitational force