The Planets

For a planet, the escape velocity is V_(e) . The presence of atmosphere on the planet shows that the

What are inner planets and outer planets ? Name them .

Two planets have the same mass, M. Each planet has a constant density, but the density of planet 2 is twice as high as that of planet 1. Identical objects of mass m are placed on the surfaces of the planets. What is the relationship of the gravitational potential energy, U_(1) on planet 1 to U_(2) on planet 2?

Statements: All stars are planets. All planets are glaxies Conclusions: I. All galaxies are planets II. All starts are glaxies.