Relative size of a brown dwarf

This image shows the relative size of a brown dwarf. A brown dwarf is a strange cosmic object that can be considered a "failed star": not massive enough to be a star, but more massive than a planet. (Credits: NASA/ESA/A. Simon, NASA GSFC, Canadian Space Agency)

In descending order of size: the Sun, a low-mass star, a brown dwarf, Jupiter, Earth.