A 100-pound person on Earth would weigh 38 pounds on Mars.
102
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
It takes eight and a half minutes for light to get from the sun to earth.
159
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
10
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178