how does changing the distance between two objects affect the gravitational force between them? what about changing their masses​

Explanation:

So as the mass of either object increases, the force of gravitational attraction between them also increases. ... Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces.

The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them. This means that the force of gravity increases with mass, but decreases with increasing distance between objects

hotter stars = bluer stars

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.