Jupiter is bigger than all the other planets combined.
254
Sound doesn't travel in space.
255
The earth travels through space at 660,000 miles per hour.
189
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Some asteroids have other asteroids orbiting them.
131
Mars had an oxygen-rich atmosphere around 4 billion years ago
13