Suppose you observe two stars and you know they have the same luminosity. If one star is ten times closer than the other, the closer star will appear how many times brighter?

The correct answer is: 100 times.

Explanation:

The reason for this can be explained in terms of luminosity and distance.

Star luminosity also is a variable dependent of the size of the star, but in this example, both stars are the same size.

The closer a star is, the brighter it will appear.

If we have two stars that are both the same size and same luminosity but one is ten times closer than the other. (10x) the star that is further away would appear to be 1/100 times brighter than the star that is closer.

In conclusion, the correct answer is 100 times.

force tends to be low and long diustance masses are high

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me