The population of the Earth has more than doubled since 1950.
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
The sun is 330,330 times larger than the earth!
Saturn's rings are about 500,000 miles in circumference but only about a foot thick.
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.