While main sequence stars trace a diagonal line on the H-R diagram, red giant stars create a horizontal line in varying shades of red. This is called the red giant branch.

Most stars are main sequence stars that fuse hydrogen to form helium in their cores - including our Sun. ... (H-R) diagram, a graph of stars based on their brightness and color ...

In fact, stars fell into several groups, and over the years we've learned about why that happens. Most stars are stable, like the Sun, and fall into the Main Sequence of the plot. Some are old, some ...

In fact, the H-R diagram reveals the fate of the giants. The diagram contains a group of stars that form a diagonal line below the main sequence, which means they are dimmer than main-sequence ...

H-R Diagram of media stars. By Phil Plait. July 27, 2010 12:00 PM. Tweet Share Share Comment Tweet Share Share Comment Graphing variables is a critical skill in science. If ...