The big problem with the early telescope is that it used mercury. Mercury is really bad for people and the environment. The good thing about a liquid scope is that you can pretty easily make a ...

The big problem with the early telescope is that it used mercury. Mercury is really bad for people and the environment. The good thing about a liquid scope is that you can pretty easily make a ...

This image of Mercury passing in front of the sun was captured on November 8 ... This article explores three major obstacles ...