The largest planet in our solar system by mass is Jupiter. This gas giant has more than twice the mass of all the other planets combined. It's huge! Jupiter's diameter is about 11 times that of Earth, and its volume is more than 1,300 times that of Earth. But even though it's so much bigger than our home planet, Jupiter only has about one-third the density of Earth. That means if you could find a big enough bathtub, you could float Jupiter in it!