Jupiter is bigger than all the other planets combined.
254
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
Jupiter's moon Ganymede, is larger than the planet Mercury!
149
The heart of an astronaut actually gets smaller when in outer space.
216
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The population of the Earth has more than doubled since 1950.
151