Which is the dependent variable, the stars or the constellation

The constellation is the dependent variable because they depend on the stars to form them.

Stars are independent variables in this case because they do not need constellations to form them.

Constellations are dependent variables in this case because they depend on stars to form them. Constellations are literally a group of stars that make an imaginary picture to us.

powerful computers now, not then

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.