Question

Astronomers cannot use parallax to find the distance to most stars. This is because the stars are?

A. too small.
B. too close.
C. moving too fast.
D. too far away.

Answer 1

D. too far away.

Step-by-step explanation:

You want to know why parallax cannot be used to find the distance to most stars.

Parallax

The use of parallax to find distance to an object depends on there being an accurate measurement of viewing angles and their differences.

For most stars, their position in the night sky does not change enough from one viewpoint to another that the necessary angles can be determined with sufficient accuracy. In short, most stars are too far away.