Science
What is a supernova?
A supernova is the colossal explosion of a dying star, briefly outshining an entire galaxy. It happens when a massive star runs out of fuel and collapses, or when a white dwarf is tipped over a mass limit — scattering elements across space.
See it, don’t just read it.
Watch a 2-minute lesson with voice + animation that explains a supernova.
Key things to understand
- 1It's the explosive death of a star.
- 2Massive stars explode when their core collapses after running out of fuel.
- 3The blast can briefly outshine billions of stars.
- 4It forges and scatters heavy elements like gold and iron.
- 5It can leave behind a neutron star or a black hole.
Frequently asked questions
- What causes a supernova?
- Either a massive star's core collapsing when it exhausts its fuel, or a white dwarf gaining too much mass and detonating.
- Why are supernovae important?
- They forge heavy elements and scatter them into space, seeding future stars, planets, and even the atoms in our bodies.
- What's left after a supernova?
- Often a dense neutron star or, for the most massive stars, a black hole, surrounded by an expanding cloud of debris.