Is Jupiter 2 times as big as all the other planets combined?

Answer 1

It matters what you mean by "size". There isn't a planet that even comes near half the mass of Jupiter, the closest candidate would be Saturn, but I'm guessing that by "size" you mean diameter. In that case, the answer would be Uranus, whose radius is about 25,000 km (compared to Jupiter's 70,000 km). That still isn't half, but it's the closest answer there is.

I think it's probably the volume that's meant. In that case Saturn is a fairly good answer.

Answer 2

No such planet exists in our solar system, but planets larger than Jupiter exist orbiting other suns. The largest planet appears to be HD 100546 b, which orbits a young blue star about 320 light years away.

Answer 3

In terms of total mass, Jupiter is over twice that of all other planets put together. In terms of volume, all other planets combined make up around 2/3 of Jupiters Volume.

Answer 4

Yes, Jupiter is 2 times as big as all the other planets combined