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
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
Lightning strikes about 6,000 times per minute on this planet!
158
The heart of an astronaut actually gets smaller when in outer space.
216
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
If aliens located 60-65 million light years away from us, looked at earth through a really powerful telescope today, they would see dinosaurs!
18
An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82