One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
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
The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
Today's top fuel dragsters take off with more force than the space shuttle.
120