If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans.

If I have questions about the universe on my mind when I go to bed, I can't turn off. I dream equations all night.

We won't know for a few years.

The radiation left over from the Big Bang is the same as that in your microwave oven but very much less powerful. It would heat your pizza only to minus 271.3*C - not much good for defrosting the pizza, let alone cooking it.

Before we understand science, it is natural to believe that God created the universe. But now science offers a more convincing explanation.

A theory is a good theory if it satisfies two requirements: it must accurately describe a large class of observations on the basis of a model that contains only a few arbitrary elements, and it must make definite predictions about the results of future observations.

Ever since the dawn of civilization, people have not been content to see events as unconnected and inexplicable. They have craved an understanding of the underlying order in the world. Today we still yearn to know why we are here and where we came from. Humanity's deepest desire for knowledge is justification enough for our continuing quest. And our goal is nothing less than a complete description of the universe we live in.