Question

practice 4
examine the diagram to see some stars and observation positions, then choose all true statements.
an observer at position b would see star x as the brighter star
an observer at position b would see star y as the brighter star
an observer at position a would see star y as the brighter star
an observer at position a would see star x as the brighter star

Explanation:

Apparent brightness of a star from an observer's position depends on distance; the closer star appears brighter.

1. Position B is closer to Star Y than Star X, so Star Y looks brighter here.
2. Position A is closer to Star X than Star Y, so Star X looks brighter here.

Answer:

B. An observer at Position B would see Star Y as the brighter star
D. An observer at Position A would see Star X as the brighter star