This is how the James Webb telescope points so accurately – checks a star 16 times per second to update mirror steering. Could see an eye blink 500 km away. Made in Canada!
Details: https://t.co/tiNHhEE2iv @csa_asc @COMDEV_Intl pic.twitter.com/dryJ9MinSB

— Chris Hadfield (@Cmdr_Hadfield) February 20, 2022