What are stars made of, and why do some look blue while others are red? This Crash Course video dives into the science of stars and how we categorize them. It teaches about stellar spectra (the light stars give off) and shows how that reveals a star’s temperature, size, and brightness. Viewers also learn about the Hertzsprung–Russell diagram, an essential tool that plots star brightness versus temperature and shows where stars fall during their lifetimes. Understanding stars is fundamental to astronomy and astrophysics – knowledge useful for projects on the life cycle of stars or any career studying the universe.
What are stars made of, and why do some look blue while others are red? This Crash Course video dives into the science of stars and how we categorize them. It teaches about stellar spectra (the light stars give off) and shows how that reveals a star’s temperature, size, and brightness. Viewers also learn about the Hertzsprung–Russell diagram, an essential tool that plots star brightness versus temperature and shows where stars fall during their lifetimes. Understanding stars is fundamental to astronomy and astrophysics – knowledge useful for projects on the life cycle of stars or any career studying the universe.
