[jonrick46]

The James Webb Space Telescope, scheduled to be launched, October 2021 will have a primary mirror of 6.5 meters (21.3255 feet)in diameter. The Hubble has a primary mirror of 2.4 meters (7.87402 feet) in diameter. Think of the detail the James Webb will have with its 6.25 times more collecting area! Also, the James Webb has tremendous infra red capabilities (from 0.6 to 28 micrometers) while the Hubble studies objects in the ultraviolet spectrum. As the James Webb studies further into the cosmos, light shifts into the infrared spectrum.

[Nateman]

....scheduled to be launched, October 2021 ...

Development began in 1996 for a launch that was initially planned for 2007 and a 500-million-dollar budget. They have now spent 10 billion dollars on this. I do hope it works someday but this is a prime example of how Government screws up everything it touches.

[zeugma]

I'm wondering if any attempt will be made to combine the Hubble and Webb telescopes. Not physically, obviously, but by having them both attempt to resolve the same object simultaneously, you would have an effectively much larger scope.

[mabarker1]

Did they quadruple the check Grinding Spec’s on the Mirror ?

We don’t need a repeat of the fox paw on Hubble.

Hubble’s Mirror Flaw | NASA

https://www.nasa.gov/content/hubbles-mirror-flaw

Shortly after the Hubble Space Telescope’s launch in 1990, operators discovered that the observatory’s primary mirror had an aberration that affected the clarity of the telescope’s early images. Hubble’s primary mirror was built by what was then called Perkin-Elmer Corporation, in Danbury, Connecticut...

Ultimately the problem was traced to miscalibrated equipment during the mirror’s manufacture. The result was a mirror with an aberration one-50th the thickness of a human hair, in the grinding of the mirror.