Posted by **Mary** on Tuesday, February 19, 2008 at 1:24am.

If one star is at a distance of 100 light years, how far away would a second star that is 9 times as luminous, have to be to appear at the same brightness as the first?

## Answer This Question

## Related Questions

- science - Suppose that you can just barely see a certain star that is at a ...
- Math - How bright a star appears can depend on how much light the star actually ...
- Advanced Functions - How bright a star appears can depend on how much light the ...
- pre-calc - How bright a star appears can depend on how much light the star ...
- Astronomy - The apparent brightness of a Cepheid variable star in a far-away ...
- Adv. Func./Science Question - Hi, I have this question that I will be tested on ...
- Calculus 1 - A variable star is one whose brightness alternately increases and ...
- Math - A variable star is one whose brightness alternately increases and ...
- Science please help :)? - 3. which if the following factors determines how long ...
- science help PLS - An astronomer sees two stars in the sky. Both stars are ...

More Related Questions