The James Webb Telescope

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Zorba

Lifer
Oct 22, 1999
15,243
10,815
136
I hate, hate, hate to say this but this bird is so damm complex it might be doomed winding up as a $2 billion paperweight.
At some point you have wonder if it would've been cheaper to just build two, so if they first one failed just send it's replacement, instead of testing and testing and testing.
 

SteveGrabowski

Diamond Member
Oct 20, 2014
7,416
6,150
136
Had been seeing some articles about this and meaning to learn more. Giddy about what it could bring us. I'm not sure that we'll get another "whoa" moment like the Hubble Deep Field image, but you never know.

This can see into the infrared spectrum so will be able to see star formation where other parts of the spectrum are filtered out by the dust clouds surrounding new stars. Our own atmosphere filters out infrared radiation so we can't observe this from ground level. Very much expecting what the James Webb Telescope finds to be way more interesting than the Hubble Deep Field image was.
 
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Ajay

Lifer
Jan 8, 2001
16,094
8,109
136
A review board, headed by NASA, made the decision that additional testing is required to ensure that these vibrations haven’t damaged any components in the observatory. Therefore, the date of the launch is now moved from December 18 to “no earlier than” December 22.

Uh, how can 'vibrations' be a problem for a satellite that is going to be launched into space aboard a thundering rocket ship??
 
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Fenixgoon

Lifer
Jun 30, 2003
32,097
10,902
136
Uh, how can 'vibrations' be a problem for a satellite that is going to be launched into space aboard a thundering rocket ship??
the vibrations could be of a larger magnitude or in a different direction than designed for.
 

Ajay

Lifer
Jan 8, 2001
16,094
8,109
136
the vibrations could be of a larger magnitude or in a different direction than designed for.
Well, they won't be of a larger magnitude, but they could have been in a plane that could do more damage. Max acceleration threshold should be pretty high for a n unmanned launch package.
 

Red Squirrel

No Lifer
May 24, 2003
68,442
12,607
126
www.anyf.ca
One interesting thing about this telescope is it's actually designed to see more in the infrared spectrum, since the stuff it's designed to look at is so far away and traveling away so fast that it is red shifting so the light coming back is at a lower frequency.
 

Ajay

Lifer
Jan 8, 2001
16,094
8,109
136
The sooner the better. Waiting for this space telescope to get launched has been pretty frustrating.
 

Artorias

Platinum Member
Feb 8, 2014
2,146
1,431
136
With a cost of $10 billon dollars lets hope the launch goes well.

Just how much more powerful is it compared to the Hubble? Can't wait to see some of the pictures it captures.
 
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[DHT]Osiris

Lifer
Dec 15, 2015
15,270
13,571
146
With a cost of $10 billon dollars lets hope the launch goes well.

Just how much more powerful is it compared to the Hubble? Can't wait to see some of the pictures it captures.
Very. It's infrared though right? Or is it visible and infra?
 

Ajay

Lifer
Jan 8, 2001
16,094
8,109
136

All the sensors (instruments) are operating in the near infrared to infrared light spectrum.

It has ~7 times the light gathering ability (and better detectors than the older Hubble).
 

Roger Wilco

Diamond Member
Mar 20, 2017
4,132
6,165
136
If launch is successful, it has to establish an orbit well beyond the moon, and then it’s gotta unfurl itself into its final form without breaking anything.

And it’s not repairable.
 

Spacehead

Lifer
Jun 2, 2002
13,067
9,858
136
Seems a bit crazy to do that on Christmas eve though, you'd think they would have just waited until January.
I wonder if it's a timing related thing to get to it's L2 location?


Just how much more powerful is it compared to the Hubble? Can't wait to see some of the pictures it captures.
The primary mirror of JWST, the Optical Telescope Element, consists of 18 hexagonal mirror segments made of gold-plated beryllium which combine to create a 6.5 m (21 ft) diameter mirror — considerably larger than Hubble's 2.4 m (7 ft 10 in) mirror. Unlike the Hubble telescope, which observes in the near ultraviolet, visible, and near infrared (0.1 to 1 μm) spectra, JWST will observe in a lower frequency range, from long-wavelength visible light through mid-infrared (0.6 to 28.3 μm), which will allow it to observe high redshift objects that are too old and too distant for Hubble to observe.
https://en.wikipedia.org/wiki/James_Webb_Space_Telescope
 

Red Squirrel

No Lifer
May 24, 2003
68,442
12,607
126
www.anyf.ca
Moved to tomorrow at 7:20EST. I don't think I want to get up that early... but for something like this, I might.


Either this is going to be the best Christmas ever for some people... or the worst Christmas ever. Imagine if the rocket explodes on the launchpad.
 
Reactions: Roger Wilco

JEDI

Lifer
Sep 25, 2001
29,391
2,736
126
At some point you have wonder if it would've been cheaper to just build two, so if they first one failed just send it's replacement, instead of testing and testing and testing.
how much did all the testing costs?
 

JEDI

Lifer
Sep 25, 2001
29,391
2,736
126
probably a shitton. they have a full-size cryogenic chamber to test the damn thing :O :O :O
wtf sunk cost?!
yeah, nasa should have made 2.
launch the 2nd one at the opposite of Earth. view the other side of the universe
 

Racan

Golden Member
Sep 22, 2012
1,147
2,079
136
With more than 300 points of failure, I expect something will go wrong, I just hope they can salvage it and not be a total loss. The launch will go ok though I'm sure.

Less than 3 hours from now

Launch Countdown Webb/NASA
 

Red Squirrel

No Lifer
May 24, 2003
68,442
12,607
126
www.anyf.ca
So far so good as far as this being a go. Less than a half hour to launch if all checks out.

Got up early, started watching live stream now.
 
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