Summer on Uranus lasts for 21 years.
358
A comet's tail always points away from the sun.
2
Astronauts get taller when they are in space.
224
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
The Earth gets heavier each day by tons, as meteoric dust settles on it.
118
Jupiter is bigger than all the other planets combined.
254
The Earth gets 100 tons heavier every day due to falling space dust.
673