Celestial Distances

A self-checking practice quiz on celestial distances: why distances matter, units such as the light-year and parsec, stellar parallax and its calculation, standard candles including Cepheids and Type Ia supernovae, the cosmic distance ladder, and distances to galaxies. Every question is multiple choice and shown one at a time, and the set is drawn fresh each time you take it. At the end you receive a report showing how many you answered correctly.