# Einstein's twin paradox explained

- Institution: TED
- Department: TED-Ed
- Speaker: Amber Stuver
- Year: 2019
- Level: For everyone
- Language: English
- Subjects: Mathematics, Astronomy and space, Teaching and learning
- Source: [TED](https://www.ted.com/talks/amber_stuver_einstein_s_twin_paradox_explained)
- Licence: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/) (Non-commercial use only, and no changed versions.)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

On their 20th birthday, identical twin astronauts volunteer for an experiment. Terra will remain on Earth, while Stella will board a spaceship. Stella's ship will travel to visit a star that is 10 light-years away, then return to Earth. As they prepare to part ways, the twins wonder what will happen when they're reunited. Who will be older? Amber Stuver investigates the "Twin Paradox." \[Directed by Aim Creative Studios, narrated by Bethany Cutmore-Scott, music by André Aires\].

## Lectures

1. [Einstein's twin paradox explained](https://invisiblenetwork.ai/learn/ted/amber_stuver_einstein_s_twin_paradox_explained/3d66bac882de), 6 min (TED's player)