Pluto is smaller than Russia.
9
41% of the moon is not visible from earth at any time.
103
Lightning strikes about 6,000 times per minute on this planet!
158
Sound doesn't travel in space.
255
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
The earth rotates more slowly on its axis in March than in September.
145
The light hitting the earth right now is 30 thousand years old.
163
The population of the Earth has more than doubled since 1950.
151