How Do We Know the Universe is ACCELERATING?

About this video
Duration: 3 minutes, 26 seconds

You can see this video here, on the MinutePhysics YouTube channel.

The universe is expanding – this we know from looking at red shifts of distant galaxies – but the acceleration of the universe's expansion is harder to measure. It requires measuring the change of recession velocity over time, and it's done by comparing Type Ia supernovas as standard candles at different distances, which is how we know the universe is accelerating!


Tags
Universe, Wide Field Infrared Survey Telescope

Credits

Created by Henry Reich for MinutePhysics

Publication: May 9, 2017