Question

an Astronomy question, please answer it comprehensively. Thank you

How do astronomers find the distance to a globular clusters whose main sequence stars are too dim to see? Make sure to describe ALL of the necessary steps.

Answer 1

Astronomers use an effect called parallax to measure distances to nearby stars. Parallax is the apparent displacement of an object because of a change in the observer's point of view. The astronomers used trigonometric parallax to nail down the cluster's distance. This technique measures the tiny, apparent shift of an object's position due to a change in an observer's point of view. Hubble measured the apparent tiny wobble of the cluster stars due to Earth's motion around the Sun