The population of the Earth has more than doubled since 1950.
151
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 volume of the Earth's moon is the same as the volume of the Pacific Ocean.
178
Only 55% of Americans know that the sun is a star.
986
Astronauts cannot burp in space.
232
Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
9