Size comparison between the Hubble primary mirror and the JWST primary mirror

[rcjordan]

http://jwst.nasa.gov/images/JWST-HST-primary-mirrors.jpg

[Mackin USA]

BIG

[ergophobe]

Wow! This makes me want to go off an learn something about astronomy. I can see it's bigger, but I don't know what that means in terms of applications, insights... but not today. Other fish to fry