While a cosmic distance ladder sounds like fun, it is actually the name given to the variety of methods astronomers use to determine the distance to objects in space. This video examines the method of determining the distance of a star...

Are there more stars in the universe than grains of sand in the sea? This video looks at the way scientists attempt to answer this question by using data from NASA and focusing on observable space.

This Khan Academy resource is a video about what a Supernova (Supernovae) is.