Safe and sound within the confines of our daily routines, it's hard to imagine the uncharted vastness that is Outer Space. Want to brush up on your astronomy knowledge? Here are three commonly-held truths about astronomy and Outer Space that are actually false.

The North Star is the brightest star in the night sky.
The North Star is actually of average brightness. It only appears to be the brightest star because of its close proximity to the North Celestial Pole (NCP). However, it remains true that if you're in the northern hemisphere, you can always determine your direction by looking for the North Star. 

It takes the Earth one year (365 days) to orbit the Sun.
To complete one revolution, it takes the Earth a period of 365.24 days (approximately 365-1/4 days).

There's no gravity on the Moon.
The Moon does have significant gravity; it just has less than the Earth's.

44 Common Misconceptions About Astronomy [SCC Physics Department]
Heavenly Errors: Misconceptions about the real nature of the universe [University of Maine]
Introduction to Astronomy [ASD Planetarium]