Question

An astronomer sees two stars in the sky. Both stars are equally far from Earth, but the first star is dimmer than the second star. Which of the following is a valid conclusion about the first
1) It is larger than the second star. 2) It is smaller than the second star. 3) It is older than the second star. 4) It is younger than the second star.

Answer 1

When an astronomer sees two stars in the sky, It will be smaller than the second star.

• A star's brightness depends on two factors namely the earth's distance and the star's length. The more distance the star appears dimmer from the Moon. And the star's larger, it's brighter.
• This is represented by relation as b = L/4πd², Where L is the luminosity and d is the distance  luminosity dependent on the surface area of the star.
• Since, the two stars are at the same distance by the Moon here. The dimmer is the first star. By this we can infer that the first light must be larger than the second star.

Answer 2

Answer:

A, it is larger than the second star.

Explanation:

when a star are equally far from earth but one is dimmer than the second the star is larger tha the other.