One thousand Jupiters could fit inside the sun. Jupiter has a diameter of 143,000 kilometers and a volume of 1.4 x 10^15 cubic kilometers. The sun has a diameter of 1,391,684 kilometers and a volume of 1.4 x 10^24 cubic kilometers.
Jupiter is the largest planet in the solar system, and it could hold all the other planets inside its atmosphere. According to one leading scientific theory, Jupiter is actually a failed star. Had the planet been 80 times larger, hydrogen fusion would have begun in the core of Jupiter, and a brown dwarf star would have been born instead of a planet.