Most gas hydrates form when what occurs

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

What was the purpose of the apollo program? to put a man in orbit to launch a spy satellite to launch a space station to put man on the moon