Question

Calculate two stars appear to you to have the same brightness. if star a is 7.00 light-years away from you, while star b is 15.00 light-years away, how many times more luminous is star b than star a?

Answer 1

It  is eight times more than the star A.

What is luminosity  and on which it depends?

The luminosity of an object is a measure of its intrinsic brightness and is defined as the amount of energy the object emits in a fixed time.

luminousity depends upon the two factors are:

1) The star's actual brightness

Some stars are naturally more luminous than others ,so the brightness level from one star to next star is significantly different.

2) The star distance from us

The more distance of an object the dimmer it appears.

Energy emitted = sAT⁴

where s is stefan constant

A is surface area and T is temperature  .  

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