The universe is vast — possibly even infinite — and in the scheme of things, our planet is tiny. Even in our own solar system, Earth is dwarfed by gas giants like Jupiter. But are there bigger planets out there? How much bigger? What is the biggest planet we know of?
The answer depends on several factors, including how you define a planet. Even so, there are a few candidates for the largest known planet. One of the largest is called ROXs 42Bb, a gas giant orbiting a star about 460 light-years from Earth. It is about nine times the mass of Jupiter and has a radius of about 2.5 that of Jupiter.
