Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Summer on Uranus lasts for 21 years.
358
A neutron star (what remains after a Super Nova) is so dense that a portion of it the size of a sugar cube would weigh as much as all of humanity, or more than all the cars in the United States.
5
All of the Earth's continents are wider at the north than in the south - and nobody knows why.
194
It takes eight and a half minutes for light to get from the sun to earth.
159
A 100-pound person on Earth would weigh 38 pounds on Mars.
102
It 'snows' metal on Venus.
13
A car traveling 100 mph would take more than 29 million years to reach the nearest star (to our solar system)
88