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Physical & Life Sciences
Ocean planet discovered 100 ly from Earth
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<blockquote data-quote="Halbhh" data-source="post: 76886763" data-attributes="member: 375234"><p>One of the fun things I learned years ago (5? 10 years ago?) is that early star types in the Universe would be dominated by supergiant stars low in metals and typically vastly larger than current stars around us now here in our local galaxy -- that's why I used an example to you above of a wolf rayet star -- 136a1 -- as a representative that is getting there: sorta like those early stars in that its very massive and emits almost all of its radiation in a range we cannot see.</p><p></p><p>But, and this is what I said above, but perhaps unclearly, if we could (magically) be much closer but not too close, so that instead a large redshift, we had a much smaller redshift (but we'd still be vastly distant then...), it would be fun to simulate what such a star might look like <em>redshifted a smaller amount so that its main spectrum of emission is in the human visual range.</em> </p><p></p><p>I expect if you read much in astronomy this might not be new to you about the supergiant low metal early stars. It's old to me and I tend to sometimes forget to mention things that are old to me.</p><p></p><p></p><p>I was on the other hand learning a <em>new </em>thing of some interest just before coming here to CF, which maybe would be interesting to you (unless you already read about it), about how the <em>particular </em>color choices in some of the spectacular galaxy images released to the public were chosen, in order to emphasize certain features of the emitting materials in a way that is more informative.</p><p></p><p>By bringing up the intensity of some features and subduing others, etc, but I'll quote a bit more than that also: </p><p></p><p>-------</p><p>“We have filters on the instruments that collect certain wavelengths of light, which <em>we then apply a color that is most closely what we think it will be on the [visible] spectrum,</em>” said Alyssa Pagan, a science visuals developer at the Space Telescope Science Institute, in a phone call with Gizmodo.</p><p></p><p>"The chromatic ordering depends too on what elements are being imaged. When working with narrow-band wavelengths in optical light—oxygen, ionized hydrogen, and sulfur, Pagan suggests—the latter two both emit in red. <em>So the hydrogen might get shifted to green visible light, in order to give the viewer more information.</em></p><p></p><p>“It’s a balance between the art and the science, because you want to showcase science and the features, and sometimes those two things don’t necessarily work together,” Pagan added.</p><p></p><p>"When telescope images are being assembled, image processors work with instrument scientists to decide which features of a given object should be highlighted in the image: its piping hot gas, perhaps, or a cool dusty tail.</p><p></p><p>Stephan’s quintet as seen by three MIRI filters.</p><p><img src="https://i.kinja-img.com/gawker-media/image/upload/c_fit,f_auto,g_center,pg_1,q_60,w_965/c761ce3edf65caf06bcb8585ccda2a14.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p>"When Webb imaged Stephan’s Quintet, a visual grouping of five galaxies, the finished product was a 150-million-pixel image made up of 1,000 images taken by both MIRI and NIRCam. When just seen by MIRI, though, hot dust dominates the image. In the background of the MIRI images, distant galaxies glow in different colors; DePasquale said the team calls them “skittles.”</p><p></p><p>"DePasquale and Pagan helped create the Webb images as we would eventually see them, rich in color and cosmic meaning. In the case of the sweeping shot of the Carina Nebula’s cosmic cliffs, different filters captured the ionized blue gas and red dust. In initial passes at the nebula image, the gas obscured the dust’s structure, scientists asked the image processing team to “tone down the gas” a bit, Pagan said.</p><p><a href="https://gizmodo.com/webb-space-telescope-image-colorization-1849320633" target="_blank">Are the Colors in Webb Telescope Images 'Fake'?</a></p></blockquote><p></p>
[QUOTE="Halbhh, post: 76886763, member: 375234"] One of the fun things I learned years ago (5? 10 years ago?) is that early star types in the Universe would be dominated by supergiant stars low in metals and typically vastly larger than current stars around us now here in our local galaxy -- that's why I used an example to you above of a wolf rayet star -- 136a1 -- as a representative that is getting there: sorta like those early stars in that its very massive and emits almost all of its radiation in a range we cannot see. But, and this is what I said above, but perhaps unclearly, if we could (magically) be much closer but not too close, so that instead a large redshift, we had a much smaller redshift (but we'd still be vastly distant then...), it would be fun to simulate what such a star might look like [I]redshifted a smaller amount so that its main spectrum of emission is in the human visual range.[/I] I expect if you read much in astronomy this might not be new to you about the supergiant low metal early stars. It's old to me and I tend to sometimes forget to mention things that are old to me. I was on the other hand learning a [I]new [/I]thing of some interest just before coming here to CF, which maybe would be interesting to you (unless you already read about it), about how the [I]particular [/I]color choices in some of the spectacular galaxy images released to the public were chosen, in order to emphasize certain features of the emitting materials in a way that is more informative. By bringing up the intensity of some features and subduing others, etc, but I'll quote a bit more than that also: ------- “We have filters on the instruments that collect certain wavelengths of light, which [I]we then apply a color that is most closely what we think it will be on the [visible] spectrum,[/I]” said Alyssa Pagan, a science visuals developer at the Space Telescope Science Institute, in a phone call with Gizmodo. "The chromatic ordering depends too on what elements are being imaged. When working with narrow-band wavelengths in optical light—oxygen, ionized hydrogen, and sulfur, Pagan suggests—the latter two both emit in red. [I]So the hydrogen might get shifted to green visible light, in order to give the viewer more information.[/I] “It’s a balance between the art and the science, because you want to showcase science and the features, and sometimes those two things don’t necessarily work together,” Pagan added. "When telescope images are being assembled, image processors work with instrument scientists to decide which features of a given object should be highlighted in the image: its piping hot gas, perhaps, or a cool dusty tail. Stephan’s quintet as seen by three MIRI filters. [IMG]https://i.kinja-img.com/gawker-media/image/upload/c_fit,f_auto,g_center,pg_1,q_60,w_965/c761ce3edf65caf06bcb8585ccda2a14.png[/IMG] "When Webb imaged Stephan’s Quintet, a visual grouping of five galaxies, the finished product was a 150-million-pixel image made up of 1,000 images taken by both MIRI and NIRCam. When just seen by MIRI, though, hot dust dominates the image. In the background of the MIRI images, distant galaxies glow in different colors; DePasquale said the team calls them “skittles.” "DePasquale and Pagan helped create the Webb images as we would eventually see them, rich in color and cosmic meaning. In the case of the sweeping shot of the Carina Nebula’s cosmic cliffs, different filters captured the ionized blue gas and red dust. In initial passes at the nebula image, the gas obscured the dust’s structure, scientists asked the image processing team to “tone down the gas” a bit, Pagan said. [URL='https://gizmodo.com/webb-space-telescope-image-colorization-1849320633']Are the Colors in Webb Telescope Images 'Fake'?[/URL] [/QUOTE]
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