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 ...

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 ...

For the two dozenth episode of Crash Course Astronomy, we have to take a step away from the straight astronomy stuff and talk a little bit about light. After all, pretty much everything we know about ...

The stars are not as they seem. The nearest one is tens of trillions of kilometers away, a distance so terrible that the might and power of Alpha Centauri is reduced to a faint spark that can be ...