Mars had an oxygen-rich atmosphere around 4 billion years ago
13
In the last 7 years, humanity has discovered 43 potentially habitable planets.
14
The volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
In outer space there exists a gigantic cloud of alcohol which can be used to produce 400 trillion trillion pints of beer.
31
More than 20 million meteoroids enter Earth's atmosphere every day.
139
The heart of an astronaut actually gets smaller when in outer space.
216
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