tars come in many sizes and colours, as this diagram for my Illustrated Atlas of the
shows. On the bottom right are Arcturus (orange giant), Rigel (blue giant), Sirius
A (blue dwarf) and the Sun (yellow dwarf). Meanwhile on the left at the top the Sun is shown blown
up and compared with Proxima Centauri (a red dwarf) and Sirius B (a white dwarf).