There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
Mars had an oxygen-rich atmosphere around 4 billion years ago
13
Only 55% of Americans know that the sun is a star.
986
One pinhead of the sun's energy is enough to kill a person at a distance of 160 kilometers.
277
Summer on Uranus lasts for 21 years.
358