1. The problem statement, all variables and given/known data There are a big object and an astronaut in space. How do we calculate the gravitational force between them. I enclose a photo. I have given the mass of an astronaut, the dimensions of this giant ring and density of the ring. There is also a mistake in the photo. The astronaut is not 2*R away, but only 1*R away from the top of the ring. 2. Relevant equation F=G*m*M/r2 3. The attempt at a solution I do not know how to start solivng it. I know how to calculate the force between a point and a thin ring and between a point and a thin circle... but this homework is really hard for me. I would be greatful if I got any key ideas or maybe some beginnings of solution. Help me please!