The structure of a ringed planetary nebula revealed in the infrared
Click for original image.
Cool image time! Using the mid-infrared camera on the Webb Space Telescope, astronomers have been able to image in false colors the ringed structure surrounding a dying star about 1,500 light years away.
The nebula’s two rings are unevenly illuminated in Webb’s observations, appearing more diffuse at bottom left and top right. They also look fuzzy, or textured. “We think the rings are primarily made up of very small dust grains,” Ressler said. “When those grains are hit by ultraviolet light from the white dwarf star, they heat up ever so slightly, which we think makes them just warm enough to be detected by Webb in mid-infrared light.”
In addition to dust, the telescope also revealed oxygen in its clumpy pink center, particularly at the edges of the bubbles or holes.
NGC 1514 is also notable for what is absent. Carbon and more complex versions of it, smoke-like material known as polycyclic aromatic hydrocarbons, are common in planetary nebulae (expanding shells of glowing gas expelled by stars late in their lives). Neither were detected in NGC 1514. More complex molecules might not have had time to form due to the orbit of the two central stars, which mixed up the ejected material.
Though this false-color image of a planetary nebular is hardly ground-breaking (Hubble has been producing such pictures for decades), Webb’s better infrared data, in higher resolution, will help astronomers untangle the nebula’s complex geography. It remains however a question whether the improved capabilities of Webb were worth its $10 billion-plus cost. For that money NASA could have built and launched many different astronomical missions in the past two decades, many of which would have been able to match this data for far less.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit.
The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
Click for original image.
Cool image time! Using the mid-infrared camera on the Webb Space Telescope, astronomers have been able to image in false colors the ringed structure surrounding a dying star about 1,500 light years away.
The nebula’s two rings are unevenly illuminated in Webb’s observations, appearing more diffuse at bottom left and top right. They also look fuzzy, or textured. “We think the rings are primarily made up of very small dust grains,” Ressler said. “When those grains are hit by ultraviolet light from the white dwarf star, they heat up ever so slightly, which we think makes them just warm enough to be detected by Webb in mid-infrared light.”
In addition to dust, the telescope also revealed oxygen in its clumpy pink center, particularly at the edges of the bubbles or holes.
NGC 1514 is also notable for what is absent. Carbon and more complex versions of it, smoke-like material known as polycyclic aromatic hydrocarbons, are common in planetary nebulae (expanding shells of glowing gas expelled by stars late in their lives). Neither were detected in NGC 1514. More complex molecules might not have had time to form due to the orbit of the two central stars, which mixed up the ejected material.
Though this false-color image of a planetary nebular is hardly ground-breaking (Hubble has been producing such pictures for decades), Webb’s better infrared data, in higher resolution, will help astronomers untangle the nebula’s complex geography. It remains however a question whether the improved capabilities of Webb were worth its $10 billion-plus cost. For that money NASA could have built and launched many different astronomical missions in the past two decades, many of which would have been able to match this data for far less.
On Christmas Eve 1968 three Americans became the first humans to visit another world. What they did to celebrate was unexpected and profound, and will be remembered throughout all human history. Genesis: the Story of Apollo 8, Robert Zimmerman's classic history of humanity's first journey to another world, tells that story, and it is now available as both an ebook and an audiobook, both with a foreword by Valerie Anders and a new introduction by Robert Zimmerman.
The print edition can be purchased at Amazon. from any other book seller, or direct from my ebook publisher, ebookit. The ebook is available everywhere for $5.99 (before discount) at amazon, or direct from my ebook publisher, ebookit. If you buy it from ebookit you don't support the big tech companies and the author gets a bigger cut much sooner.
The audiobook is also available at all these vendors, and is also free with a 30-day trial membership to Audible.
"Not simply about one mission, [Genesis] is also the history of America's quest for the moon... Zimmerman has done a masterful job of tying disparate events together into a solid account of one of America's greatest human triumphs."--San Antonio Express-News
I think it’s very hard to put a price value on something like JWST, but I think you are on to something in trying to assess value via opportunity cost.
I am very pleased that JWST is operational. I am displeased it cost so much to get there. (It was called “the telescope that ate astronomy” for a reason!)
But we can’t get the money back, so the priority now is to think much harder about how NASA does astrophysics in space going forward. It’s too late to do anything about WFIRST/Nancy Grace Roman (despite what appears to be Russ Vought’s wish), since it’s mostly built and paid for now anyway (and it has had surprisingly little in the way of cost overrun so far….knock on wood). But what comes after Roman? There needs to be a fundamental rethink about just how NASA procures these capabilities in a way that is more cost effective. We just can’t afford to keep doing things like we have. These monsters like the Large Ultraviolet Optical Infrared (LUVOIR) Surveyor that are in the early planning stages need to be placed on a hard hold until we can do this reassessment.
“It remains however a question whether the improved capabilities of Webb were worth its $10 billion-plus cost. For that money NASA could have built and launched many different astronomical missions in the past two decades, many of which would have been able to match this data for far less.”
Please, Robert, read up how a telescope works. Certain information can only be observed in certain wavelengths. So IR is needed in this case. Also, a big telescope can only be replaced by smaller ones, if they can be operated as an Interferometry, otherwise it lacks the resolution, and sensitivity.
This is quite basic stuff. If we can’t do it from earth (IR vs the effects of the atmosphere), and we can’t use interferormetry, we need to got big to get this data. There is no matching with smaller telescopes.
Coincidentally, Eric Berger devotes his Tuesday Telescope installment today to the same image, and the same question: Is the James Webb Space Telescope worth $10 billion?
(You can probably guess his answer, though it is interesting that he thinks the question is worth asking.)
https://arstechnica.com/space/2025/04/tuesday-telescope-is-the-james-webb-space-telescope-worth-10-billion/
“Is the James Webb Space Telescope worth $10 billion?””
Supposed to ask that question before the money is spent. After the money is gone, kind of pointless to worry about value. Yes, the telescope ended up costing way, way, way more than advertised. Still, we’ve spent more for less.