Aristotle’s Universe

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You might have heard of Aristotle. He’s the guy who said that we are what we repeatedly do. His words are often interpreted to mean that, for instance, a person who farms is therefore a farmer—or a person who writes science posts is, therefore, a science writer.

He also contributed a lot to the arenas of politics, philosophy, and basically every other field of study the Greeks could think of. His teachings were almost as widely accepted as Plato’s. And, like Plato, he had a few ideas about astronomy.

Well, most of what he taught about astronomy was dead wrong. But he had his moments. And his failures illustrate an important concept of science. No level of understanding is beyond our reach, and sometimes it takes pure imagination and guesswork to get there.

Aristotle may have been wrong most of the time, but he dared to imagine. And that’s something all scientists must do. Continue reading

From Classical Beginnings

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The universe as we know it was born out of chaos.

We have a pretty good idea of the scale of our universe and how it began—as an infinitely dense point of matter that blew apart in what we call the Big Bang. That’s chaos for you, right there.

And chaos continues to define our daily lives.

Stars are born out of the complete chaos of gravity, and nothing in the universe forms gently. Our moon was born out of a violent collision with the Earth. And I’m sure you’ve noticed how easy it is to let a room get disorganized.

All these are examples of chaos—known as entropy in science. Everything tends toward chaos. But the ancient Greeks rebelled against this idea.

In their view, everything in the cosmos had to be perfect. It was a somewhat spiritual way of looking at the universe, if you think about it. And even as they developed the groundwork for science as we know it today, one idea hindered them… Continue reading