Question

A graph used by scientists that shows stars grouped by size is called the Graph of Stellar Evolution Holly-Randall Star Graph HR Diagram HR Graph of Star Sizes

Answer 1

The HR diagram is probably the answer, scientists use it to group stars together, haven't heard of the others tbh. The HR diagram compares temperature to luminosity though, not size.

Answer 2

That was the correct answer. Thank you so much. :)