Archive | August, 2007

Mostly Empty Space

When we look at the cosmic microwave background we see both overly warm and overly cold spots. The warm spots grew into places with a lot of stuff; namely our modern galaxies. The cold spots grew into places without a lot of stuff; these are cosmic voids. While we have known for a long time […]

What is science?

As a science prof, I hear lots of people in lots of different scenarios trying to define what is the act of doing science. I’ve heard people define science as the act of doing experiments that involve carefully controlling one variable while varying only one other thing. (Um, we can’t do that in astronomy). I’ve […]