select the correct answer. which feature signifies to astronomers that a distant star is part of a planetary…

select the correct answer. which feature signifies to astronomers that a distant star is part of a planetary system? a. the star periodically dims. b. the star expands into a red giant. c. the star moves through the sky. d. the star continuously gets brighter.

select the correct answer. which feature signifies to astronomers that a distant star is part of a planetary system? a. the star periodically dims. b. the star expands into a red giant. c. the star moves through the sky. d. the star continuously gets brighter.

Answer

Brief Explanations:

When a planet orbits a star, it can pass in front of the star from our vantage - point. This is called a transit. During a transit, some of the star's light is blocked, causing the star to periodically dim. A red - giant expansion is a stage in a star's life cycle not related to the presence of a planetary system. A star's motion through the sky is due to its proper motion and not a sign of a planetary system. A star continuously getting brighter is not a sign of a planetary system but could be due to changes in the star itself like a flare or evolution.

Answer:

A. The star periodically dims.