Let’s try a demonstration that we all enjoyed in elementary school. Close one eye, hold out your thumb at arm’s length, and align it with an object on the other side of the room. Without moving your ...

Astronomers quickly become used to dealing with huge numbers. For example, in any one lecture, I might declare that the sun emits some 400 billion trillion watts of power each second, that our Milky ...

Parallax is a simple concept to understand, but as it relates to riflescopes it’s difficult to explain. According to Merriam-Webster, parallax is the apparent displacement or the difference in ...

Don't miss the big stories. Like us on Facebook. Astronomers quickly become used to dealing with huge numbers. For example, in any one lecture, I might declare that the sun emits some 400 billion ...