Question

which sentence accurately describes star clusters?
stars appear brighter.
stars form large groupings.
stars form at different times.
stars form from different nebula.

Explanation:

A star cluster is a group of stars. Stars in a cluster are bound together by gravity. So, the key characteristic is that stars form large groupings. Stars in a cluster form at approximately the same time from the same nebula. The brightness of stars in a cluster can vary, but the defining feature is the grouping.

Answer:

Stars form large groupings.