Question

The Hubble Space Telescope can see stars and galaxies where brightness is 1/50 of the faintest objects now observable using ground-based telescopes. Use the fact that the brightness of a point source, such as a star, varies inversely as the square of its distance from an observer to show that the space telescope can see about seven times farther than a ground-based telescope.

Answer 1

I need to know if this makes sense of not and why?

Answer 2

7*7 = 49 which is about 50

Answer 3

Yes, it makes sense, 7 times further is 1/49 th of brightness