Question

An astronomer see a star that is very far away but still very bright. What can she conclude about the star?

The star must be very large.

The star must be very small.

The star must be moving away from Earth.

The star must be moving closer to Earth.

Answer 1

small stars cannot be seen far away
of the star is moving, then there will be change in frequency not in intensity.

Answer 2

so the answer is?

Answer 3

If the star is moving, then there will be change in frequency not intensity