What is the biggest planet in our Solar System and in the known Universe?
What is the biggest planet? Well, I suppose it depends what you mean by ‘biggest planet’!
If you mean Solar System, that’s easy: the planet in our Solar System is Jupiter.
Jupiter has a diameter of 142,800km (88,846 miles), which is more than 11 times that of Earth (a paltry 12,756km, or 7,926 miles).
In fact, Jupiter is so big you could comfortably fit 1,300 Earths inside it.
The second largest of the Solar System planets is Saturn, with Uranus third, Neptune fourth and Earth fifth.Saturn and its rings, as seen by the James Webb Space Telescope. Credit: NASA, ESA, CSA, STScI, Matt Tiscareno (SETI Institute), Matt Hedman (University of Idaho), Maryame El Moutamid (Cornell University), Mark Showalter (SETI Institute), Leigh Fletcher (University of Leicester), Heidi Hammel (AURA)