Science
How does a supernova happen?
A supernova is the explosive death of a star. When a massive star runs out of fuel, its core collapses and rebounds in a colossal explosion — briefly outshining a whole galaxy and scattering elements that form new stars, planets, and even us.
See it in motion.
Watch a 2-minute animated lesson that shows exactly how supernovae works.
Step by step
- 1It's the explosive death of a massive star.
- 2The core collapses, then violently rebounds.
- 3It can briefly outshine an entire galaxy.
- 4It scatters elements that seed new stars and planets.
Frequently asked questions
- How does a supernova happen?
- A massive star exhausts its fuel, its core collapses, and it explodes in a brilliant burst of energy.
- Why are supernovae important?
- They forge and scatter heavy elements across space — the raw material for planets and life.
- How bright is a supernova?
- For a short time it can shine as brightly as billions of stars, outshining its host galaxy.