The Core

First full-color images and data from the James Webb Space Telescope - NASA live, starts in 30 mins

Wow. Those comparisons are stunning.

What surprised me the most is looking outside the main object at the dark sky and seeing how much of the "dark" sky is no longer dark.

I don't know anything about astronomy - are these never-before-seen objects, or objects seen with other telescopes (i.e. the best terrestrial scopes), just not the Hubble?

Also as I understand it, these are all "translations" - there's only a small amount of overlap - Hubble primarily sees in the 0.1-0.8 micron range (UV and visible) while Webb is primarily 0.6-25 microns (IR). So they really aren't "seeing" the same stuff and when NASA presents us with viewable, visible images, it's effectively some sort of artist's rendition of what shows up on the telescope.

https://www.jwst.nasa.gov/content/about/comparisonWebbVsHubble.html

That article has a cool graphic showing how far back in time they see. Hubble can see back to the end of the "toddler" galaxy period, while Webb sees to the very beginning of it and beyond to the formation of early stars.

That, by the way, is why Webb is in the near-IR. Because of red shift as the universe expands, the light from the oldest galaxies and early stars is in the near-IR range (another thing I just learned from that article)

It is staggering.

Pictures of Jupiter. I didn't know they would look at things so "close" as a planet
https://www.microsoftnewskids.com/en-us/kids/science-tech/nasa-unveils-new-james-webb-telescope-images-that-show-remarkable-details-of-jupiter

https://www.msn.com/en-us/news/technology/webb-telescope-captures-new-view-of-pillars-of-creation/ar-AA13a1vF
Webb Telescope Captures New View of ‘Pillars of Creation’

That is incredible. 

>see life on other worlds

I know i is a long shot, but imagine if Webb grabbed an image of a planet with artificial lighting?  That would change everything.

Probably much more likely is evidence of simple life somewhere.   

>artificial lighting

Heh, If we detect alien life it's likely to be advertising and spam full of alien affiliate links.

>I wonder what signal that would be from a great distance. Especially what unambiguous signal.

Unambiguous would be challenging, but we can detect gasses from a distance and if a planet has carbon dioxide,  methane and water it may have life.  If we could get detailed enough images to see evidence of plant like life, say the way our rain forests look from space, that would be a good indication.

Edit:
https://astrobiology.nasa.gov/news/detecting-lifes-influence-on-planetary-atmospheres/