The typical spec of dust that you see floating in the air is half way in size between the Earth and a subatomic particle.
131
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
Pluto is smaller than Russia.
9
It would take more than 150 years to drive a car to the sun.
569
A comet's tail always points away from the sun.
2
Sound doesn't travel in space.
255