The temperature of the earth's interior increases by 1 degree every 60 feet down.
115
If two pieces of metal touch in space, they become permanently stuck together.
807
A lightning bolt generates temperatures five times hotter than those found at the sun's surface!
127
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
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
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194