Summer on Uranus lasts for 21 years.
358
It would take more than 150 years to drive a car to the sun.
569
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
The sun is 330,330 times larger than the earth!
190
The Space Shuttle main engine weighs 1/7th as much as a train engine but delivers as much horsepower as 39 locomotives.
147
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
41% of the moon is not visible from earth at any time.
103