There are 5 to 10 times more stars in the known Universe than there are grains of sand on all the world's beaches, but a single grain of sand has more atoms than there are stars in the known Universe.
20
On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
7
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
160
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
The population of the Earth has more than doubled since 1950.
151
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
