If the Sun is about 4.6 billion years old how many complete orbits has it made around the Milky Way

It is 93 billion light years from one side to the other. Now that's a distance even astronomers find hard to think about. It's like making about 300,000 laps of our Milky Way Galaxy, yet our Sun has made only 20 laps in its entire life. Or can you imagine lapping the Earth 20 million trillion times

Explanation:

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.