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James Webb Telescope

rjh01 said:
JWST has made the "Crisis in Cosmology" WORSE (AGAIN). YouTube by Dr. Becky.
https://youtu.be/s2gFkKDMdXg?si=Xzruc1v76U_Rp_NG&t=1220

For those that do not know there are two ways of estimating the age of the universe. And they give different results. Their margins of error do not overlap. Not even close.
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When you look at the slope of the graph that results from the JWST data, it absolutely aligns with the slope of Hubble graph except that the uncertainties are much smaller.
JWST_Hubble_Tension.jpg

HST Data are the grey dots
JWST Data are the red dots


We now have two sets of data from two separate telescopes looking in different parts iof the spectrum. While they are not in perfect agreement, they nonetheless agree much more closely with each other that they do with the CMB measurements.

I think they have to be edging toward the idea that our model of the universe is wrong. There is something else going on that we are not able to observe, and therefore not able to measure.

NOTE: Maybe they ought to rename this discrepancy the Hubble-Webb tension!
 
smartcooky said:
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I think they have to be edging toward the idea that our model of the universe is wrong. There is something else going on that we are not [YET] able to observe, and therefore not able to measure.

NOTE: Maybe they ought to rename this discrepancy the Hubble-Webb tension!
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FTFY

:popcorn1

I like the name. Clearly there is "something else going on that we are not [YET] able to observe" or dark matter, dark energy and gravity would be more clearly understood.
 
Mike Helland said:
The Hubble tension is about finding a value for Hubble's constant, the expansion rate of the universe.

It's not named after the telescope.
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(OK, so I forgot to put a smiley after what I said... oops, my bad! :rolleyes: )

Of course, but the telescope is named after the astronomer who originally posited his "constant" almost 100 years ago. Interestingly, he suggested a figure of 500 km/s/Mpc. Today, astrophysicists argue between 68 (as suggested by the CMB, and 72 km/s/Mpc as suggested by measurement of Cepheid variables).
 
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Here's something interesting that NASA is planning to build and launch around 2036 or so:

Habitable Exoplanet Observatory (HabEx)

The Habitable Exoplanet Observatory (HabEx) is a concept for a mission to directly image planetary systems around Sun-like stars. HabEx will be sensitive to all types of planets; however its main goal is, for the first time, to directly image Earth-like exoplanets, and characterize their atmospheric content. By measuring the spectra of these planets, HabEx will search for signatures of habitability such as water, and be sensitive to gases in the atmosphere possibility indicative of biological activity, such as oxygen or ozone.
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Whether they can actually manage to have it ready to launch by 2036 is another question, but it may be somewhat simpler than the JWST so maybe they can actually have it completed on or nearly on schedule.
 
Interesting article even if the title is slightly on the click-baity side:

Unprecedented discovery seems to defy fundamental astronomical theories (CNN)

Also lots of JWST images you can scroll through with the arrow buttons.

On the hunt for other low-mass isolated objects, the astronomers found something they had never seen: pairs of planet-like objects with masses between 0.6 and 13 times the mass of Jupiter that appear to defy some fundamental astronomical theories.


The scientists dubbed them Jupiter Mass Binary Objects, or JuMBOs.
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I also enjoyed this video by Tom Scott about the VLT in Chile and the ELT that is also under construction. (Not JWST but telescope-related and I didn't want to start a new thread.)

 
Truly epic JWST image of the Orion Nebula:



If you look closely you’ll see see attack ships on fire off the shoulder.

No, but seriously this is like a poster for a movie or a book cover. It’s just beautiful. And they also found lots of cool rogue planets.
 
https://www.bbc.co.uk/news/science-environment-67243772

Imagine you could go back in time 4.6 billion years and take a picture of our Sun just as it was being born. What would it look like?

Well, you can get a clue from this glorious new image acquired by the James Webb Space Telescope (JWST).

Towards the centre of this object, called HH212, is a star coming into existence that is probably no more than 50,000 years old.

The scene would have looked much the same when our Sun was a similar age.

You can't actually see the glow from the protostar itself because it's hidden within a dense, spinning disc of gas and dust.

All you get are the pinky-red jets that it's shooting out in polar opposite directions.
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Hey, a new space telescope's first pictures have been revealed, and they are amazing!

Euclid telescope: First images revealed from 'dark Universe' mission

Europe's Euclid telescope is ready to begin its quest to understand the greatest mysteries in the Universe.

Exquisite imagery from the space observatory shows its capabilities to be exceptional.

Over the next six years, Euclid will survey a third of the heavens to get some clues about the nature of so-called dark matter and dark energy.
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It has a different mission from JWST, but seems to be quite capable of taking spectacular images of the cosmos. There's a lovely image of the Horsehead Nebula for example.
 
Here is a Youtube about JWST from SciShow. It has increased our knowledge about the universe. One small example super massive black holes that exist at the centre of galaxies formed when gas collapsed directly to form them. They did not start as stars. To find other examples watch the video.

 
Early universe ‘teeming’ with supermassive black holes (Asahi Shimbun)

Using the James Webb Space Telescope, Japanese scientists from the University of Tokyo and the National Astronomical Observatory of Japan observed, in high definition, 185 galaxies in the “distant universe,” which dates 12 billion to 13 billion years before the present time.

That’s 1 billion to 2 billion years after the universe was born, the researchers said.

They discovered 10 supermassive black holes in those galaxies, 50 times the predicted total of 0.2 for that location under existing theory.

Earlier observations had led astronomers to believe there were very few supermassive black holes during the cradle years of the universe.
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Puppycow said:
Here's something interesting that NASA is planning to build and launch around 2036 or so:

Habitable Exoplanet Observatory (HabEx)





Whether they can actually manage to have it ready to launch by 2036 is another question, but it may be somewhat simpler than the JWST so maybe they can actually have it completed on or nearly on schedule.
Click to expand...

Bleh. I for one am not a fan of NASA focusing its limited resources on "habitable exoplanets". Exoplanets in general, sure.

But habitable exoplanets won't be an exploitable resource in the foreseeable future. There's probably more significant cosmological observations waiting to be made. Let the people who can actually see interstellar colonization on in their future invest in finding likely candidates.
 
theprestige said:
Bleh. I for one am not a fan of NASA focusing its limited resources on "habitable exoplanets". Exoplanets in general, sure.

But habitable exoplanets won't be an exploitable resource in the foreseeable future. There's probably more significant cosmological observations waiting to be made. Let the people who can actually see interstellar colonization on in their future invest in finding likely candidates.
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NASA isn't about exploitable resources any more. The current policy is that NASA and other governmental agencies will concentrate on deep-sky exploration and research, and commercial interests will take care of exploitation. SpaceX opened that door, but they will not be the only ones to go through it.
 
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