So, am I to get this right? The universe, it's big. Like really big?
I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space.
James Webb first images – complete set of high resolution shots now live
361–370 of 410 posts
Re: James Webb first images – complete set of high resolution shots now live
#362Earlier quoted context omitted.
Nothing matters. You live for a while and then you die, but it sure can be a cool trip getting there!
The theist gets a sense of the greatness of God. The atheist concludes his own insignificance.
Count Chocula gets a sense of the length of the central finite curve.
Re: James Webb first images – complete set of high resolution shots now live
#363Re: James Webb first images – complete set of high resolution shots now live
#364Earlier quoted context omitted.
It took like 5 months to cool web to operational temperatures rolling the telescope would create so much heat all new images would be useless until it cools down again.
That makes no sense, they have to rotate it every time they take a picture otherwise they'd be looking at the same spot all the time. Motors don't emit that much heat and neither do torque wheels. Though I suppose now that I think of it, it's possible the main mirror assembly actually has no built in roll control but only pitch, since the yaw part could be done by moving the entire telescope while remaining shaded. I…
> otherwise they'd be looking at the same spot all the time
It's in an orbit around L2, so it's not statically positioned in space. L2 also moves with the earth around the Sun, so it's not statically limited to any one region of the sky.
Re: James Webb first images – complete set of high resolution shots now live
#365Earlier quoted context omitted.
It’s real light, just color shifted as the JWST is designed to look at severely very distant and thus red shifted objects. The nebula is however much closer than that. Anyway, that looks like science fiction because science fiction borrowed that look from astronomy. https://en.wikipedia.org/wiki/Nebula
I have been wondering, how does the scale of color shifting relate to the red-shift present in deep-field subject? Idly wondering: are the furtherest objects being captured, so red-shifted, that the translation for human viewing done in these images more or less balances that out, so what we see in the translated images for some thickness of distance-bubble, is what we would see from a much closer perspective with th…
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Re: James Webb first images – complete set of high resolution shots now live
#366When I was observing the 2017 total solar eclipse, my attention was interrupted for a few seconds by someone who was driving a car. Their headlights turned on as they kept driving, not stopping for a minute to see something that for a given place on earth happens once every four centuries. The few people dismissing this reminded me of that experience.
...may have been a doctor on a particularly important call.
Re: James Webb first images – complete set of high resolution shots now live
#367Earlier quoted context omitted.
So is there any reason not to point this at Proxima Centauri b, like, ASAP? https://en.wikipedia.org/wiki/Proxima_Centauri_b
WASP-96b has an orbit that passes in front of its star, Proxima Centauri b doesn't. An obvious target for the coronagraph for regular imaging, but there's no way to get a transmission spectrum of its atmosphere.
How long would we likely have to wait for another more distant star in our galaxy to pass behind it from our perspective?
Re: James Webb first images – complete set of high resolution shots now live
#368Earlier quoted context omitted.
It’s real light, just color shifted as the JWST is designed to look at severely very distant and thus red shifted objects. The nebula is however much closer than that. Anyway, that looks like science fiction because science fiction borrowed that look from astronomy. https://en.wikipedia.org/wiki/Nebula
I have been wondering, how does the scale of color shifting relate to the red-shift present in deep-field subject? Idly wondering: are the furtherest objects being captured, so red-shifted, that the translation for human viewing done in these images more or less balances that out, so what we see in the translated images for some thickness of distance-bubble, is what we would see from a much closer perspective with th…
It’s not a 1:1 color mapping to correct for red shifting. Each color represents a wavelength, but the mapping is arbitrary and chosen to maximize contrast.
Re: James Webb first images – complete set of high resolution shots now live
#369Sawdust and farts. Nobody leaves this planet alive.
Re: James Webb first images – complete set of high resolution shots now live
#370Earlier quoted context omitted.
> “Cosmic Cliffs” in the Carina Nebula (NIRCam Image): > https://stsci-opo.org/STScI-01G7ETPF7DVBJAC42JR5N6EQRH.png Is this for real?! It looks like it came right out of a Sci-Fi movie/book. Could anyone explain how much of this is post-editing magic?
Image stacking to remove noise and optical artifacts, careful use of color filters to enhance contrast and pull out detail. The press release says it used Red: F444W, Orange: F335M, Yellow: F470N, Green: F200W, Cyan: F187N, Blue: F090W. The N filters are narrowband. F470N is only 54 nanometers wide: https://jwst-docs.stsci.edu/jwst-near-infrared-camera/nircam... Almost all the light in this image is way off the red e…
While the JWST uses the red end of the human visual spectrum and narrow filters these objects are still broadband and can be imaged as such. Adam did an excellent job on widefield https://www.adamblockphotos.com/ngc-3372-carina-nebula.html and there are lots of deep field images in RGB on Astro imaging sites. The detail is phenomenal with JWST but a lot of people are saying one wouldn't see this with their eyes or with a color cam - and they're "wrong" (its complex). Your eyes just don't "collect" photons like a camera, but a color camera would see this nebula beautifully... We use NB in hobby Astro imaging a lot just to reduce the impact of light pollution.