T. Even people are attracted towards each other by gravity, but this force is so small that it is not noticeable.

unwanted objects or material left in space by human activity, such as pieces of destroyed satellite

Saturn has 82 moons

satellite which is placed directly above the Equator with a circular orbit and angular velocity identical to that of the Earth

While there are about 2,000 active satellites orbiting Earth at the moment, there are also 3,000 dead ones littering space

The telescope observes comets and planets, discovered moons around Pluto, it has helped scientists understand how planets and galaxies form.

1)communication, 2) TV broadcasting, 3) weather monitoring, 4) military

October 4, 1957, The world's first artificial satellite was about the size of a beach ball (d=58 cm),from Baikonur Cosmodrome.

Of the eight planet's, all but two planets have natural satellites. The two that don't are Mercury and Venus.

F. Gravity doesn’t disappear because someone leaves the Earth’s surface. Every object in space attracted other object by the force of gravity.

KazSat, the first Kazakh space satellite, was launched on June 18, 2006 . KazSat-2, KazSat-3

this is because at infinity we assume the p.e of any body =0. At distances lesser than infinity the p.e wil lesser, which will obviously be negative.