How do astronomers make sense out of the vastness of space? How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going ...

Astronomy is weird. Everything we study is really, really far away. So far away really, that for most of history we didn’t know how far away they were. It was impossible to measure. But then some ...

Phil explains stars and how they can be categorized using their spectra. Today Phil's explaining the stars and how they can be categorized using their spectra. Together with their distance, this ...

I’m fascinated by tides. Not so much the movement of the ocean, as you might think. That’s a product of tides; what I mean is the change of gravity over distance stretching things. Say what? Let me ...