Posted by **anastasia ** on Friday, March 25, 2011 at 6:14pm.

Suppose that you can just barely see a certain star that is at a distance of 100 light years. How far away must a star that is 4 times more luminous be barely be seen/how about a star that is 100 times more luminous?

- science -
**anastasia **, Friday, March 25, 2011 at 6:36pm
If you need to make a star to appear 4 times more luminous becuase it is because it is barely seen , then you will need to make the star appear 4 times dimmer than it would at 100 l.y. distance. The inverse propostional distance is the square root of 4 which means that you will have to double the distance by multiplying 2(the sq. rt. of 4) with 100 L.Yrs. which is equal to 200 Light Years.

## Answer this Question

## Related Questions

- Science - If one star is at a distance of 100 light years, how far away would a ...
- 8th grade math - Light travels approximately 5.87 X 10^12 miles in one year. ...
- 8th grade math - Light travels approximately 5.87 X 10^12 miles in one year. ...
- Astronomy - The apparent brightness of a Cepheid variable star in a far-away ...
- 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 ...
- Math - A star is 300 light years away from Earth. If the speed of light is 3 X ...
- Math - The distance that light travels in 1 year (a light year) is 5.88 x 10^12 ...
- Math - The distance that light travels in 1 year (a light year) is 5.88x10^12 ...

More Related Questions