Here are the next couple mysteries on the list and you can watch the video to see all the way to #1!

8. Dark Matter. Roughly 80% of the Universe is made up of material that scientists can not directly observe. Dark matter does not emit light or energy, making it invisible to us. This is why we hardly know anything about it.

7. The origins of the Universe. Nobody knows for sure how the Universe started, But the big bang is the most likely theory as there is lots of evidence towards it, the main piece of evidence is that everything is moving away from each other. This process is called redshift.

This is fascinating.  Are there any mysteries that you think should have made this list?  Feel free to comment and we hope you like the video!