Hidden in the light

Today, Newton shows us why planets move as they do, and we find out how we know what stars are made of.

Here are a couple of sites on spectroscopy, and its history.

The history of spectroscopy - from the flame test to the AAS

MIT Spectroscopy Lab - History

Because it is so much easier to follow in a video, here’s a video about what an ellipse is.

What is Ellipse?