Compare Betelgeuse and Barnard's star in terms of size, color, and lifetime

When it comes to size Betelgeuse has the radius of 820.9 million KM where as Barnard is a smaller than Betelgeuse with 136,400 KM radius. In terms of color Betelgeuse is orange red and Barnard’s star is red in color. Lifetime wise Barnard’s star is one of the oldest stars, older than sun that is 7.12 billion years where as Betelgeuse is less than 10 million years.

Betelgeuse is a class of Supergiant stars and they are 1000 times bigger than our own sun, they typically had 1000 radii. Barnard's stars belongs to Main Sequence Star in which our sun belong. Our Sun is almost seven time larger than a Barnard's star. Barnard's star typically has only 0.15 Solar radii. Our Sun has 1.0 solar radii.