41% of the moon is not visible from earth at any time.
103
There is a mysterious and loud radio signal known as 'the space roar' that has yet to be explained.
15
The Earth weighs around 6,600,000,000,000,000,000,000 tons (5,940 billion billion metric tons)!
221
The light hitting the earth right now is 30 thousand years old.
163
The earth travels through space at 660,000 miles per hour.
189
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