Why doesn’t an orbiting satellite fall back to earth?

The reason satellites don’t fall from the sky is because they are orbiting Earth. Even though the satellites are thousands of miles away, Earths gravity still tugs on them. Gravity combined with the satellite's momentum from its launch into space, cause the satellite to go into orbit above Earth instead of falling back down to the ground.
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An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -