With Hubble, we were observing at optical wavelengths and with JWST we have access to the infrared. We also have higher resolution, higher precision, and higher telescope stability. So the data quality is much better than before!
It took William Herschel a lifetime to discover Uranus back in 1781. Cosmologist James Peebles and astronomers Michel Mayor and Didier Queloz took nearly 7 years...
