What holds up the planets?
everthing is weightless in space.
Is it true that- gravity holds planets in orbit because planets are attracted to each other's gravitational force?
They are held by the force of gravity, specifically the gravitational pull of the Sun. Just as gravity holds people to the Earth's surface, and the Earth holds space stations in orbit, so the Sun holds the planets in their orbits. The orbital velocity of the planets (momentum) keeps them from falling into the Sun, while the Sun keeps them from flying off into space. This combination of counteracting forces also keeps the Earth its…