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.

There are eight planets in our Solar System.

The Hubble telescope was built by the United States space agency NASA with contributions from the European Space Agency.

T. Satellites can be natural, such as the Moon orbiting the Earth. Satellites can also be artificial.

F. The 1 kg object would fall downwards toward the centre of the Earth.

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

Satellites with polar orbits are used for monitoring the weather, military applications (spying) and taking images of Earth's surface

C)uniform

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

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

2.7 Kelvin

Solar power is energy from the Sun, They have solar panels which convert the Sun's energy into electricity that powers the spacecraft.