* By diameter: Jupiter is the widest planet in our solar system with a diameter of 142,984 kilometers (88,846 miles). Saturn comes in second at 120,536 kilometers (74,898 miles).

* By equatorial circumference: Jupiter is also the widest planet by circumference, with a circumference of 439,264 kilometers (272,946 miles). Saturn again takes second place with a circumference of 378,675 kilometers (235,298 miles).

So, regardless of whether you measure by diameter or circumference, Jupiter and Saturn are the two widest planets in our solar system.