Mars had an oxygen-rich atmosphere around 4 billion years ago
13
NASA invented baby food as we know it today.
7
The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
13
Sound doesn't travel in space.
255
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
If two pieces of metal touch in space, they become permanently stuck together.
808
When a massive power outage struck southern California in the 1990s, Los Angeles residents reportedly called 911 to express alarm about strange clouds hovering overhead; they were seeing the Milky Way for the first time.
31
Earth is the only planet in our solar system that's not named after a god or goddess.
17