Paul Geithner stated at the end of the interview that it was a really humbling to experience how hard challenges can be in developing the JWST . I can imagine how desperate he must have been when they didn't succeed in reaching the 4 degrees Kelvin. It must have looked like that it was impossible to cool something so much in the vacuum of space. I think we must realize how incredible difficult things can be and admire that the JWST is now almost in its final stage of testing. It must have been a hell of a job.
For the long storage issue, I think we can add that it is "not a problem" because it's designed in. A lot of contractors are military contractors, and they are used to missiles that stay 20 years in storage and have to work reliably only once. So the selection of grease and o-ring is guided by this prior knowledge.
Damn, the internet conked out 15 minutes into the interview! Ah, well, I'll watch it in the morning. Edit: A very interesting interview and good questions.
Since red dwarf/giant stars are so dim will JWST’s infrared be likely to find many more of these objects that are hidden “nearby” or just more farther out?
It has a narrow field of view, so it won't be a great tool for discovering them. But if you know where to look, then it'll reveal them with more detail than any other tool out there.
Hey Fraser! Question how do spray aerosols work in space? The idea occurred to me wondering if we could spray something onto the surface of the moon and it would harden or cause the dust particles to bind together and create a landing pad? Perhaps starship could spray it out as in comes in to land and it reacts with heat to polymerize really quickly. Any thoughts?
I think it's more likely that we'll have the space travel technology & infrastructure to maintain the JWST before the 10 or 14 years come to pass after it is launched. I'm calling it now; I think the JWST will be decommissioned not because it can no longer operate, but only when we have such better telescopes available, it's no longer worth it to keep it operating.
Is there anything special about the origami that is used to fold the shade? Was there an origami expert that was involved in the creation of that system?
Fraser Cain I see. So it’s not the Lagrange point at parallax position, but one of the closer ones! That explains why it only takes one month to get there! Thanks
Question. You and many others often mention using water as a shield against harmful radiation for use in deep space flight to protect future astronauts. Would the water need to be in a liquid state? Would Ice work? Would the water be contaminated and unusable?
Q: Hi Fraser, JWST field of regard is parallel to its sunshield instead of perpendicular to it. Do you know what is the design decision for it? As I think it could have wider angle of view and better protection from the sun light if the field of regard (FOR) were perpendicular to the shield.
PBS Spacetime talked about how in an entropy fluctuation model of the big bang, Boltzmann brains would outnumber observers in full universes, so we should be surprised we aren't Boltzmann brains, and this is an argument against that entropy fluctuation model of the big bang. This aspect of the anthropic principle confuses me; why shouldn't I then be surprised I'm not an insect, and reject any model of the world where insects far outnumber humans?
JWST is passively cooled - other than our MIRI instrument, it is cooled only by virtue of being in the shade. The mitigating factor on its lifetime is actually fuel for stationkeeping (keeping it in its orbit). The mission lifetime is minimum 5 years, but we'll aim for 10+.
Q: is IT possible to empty a piece of matter from all its photons? Could we take a small piece of metal for example and heat it and let all the photons leave it so it stop to glow? If so, how come we do not see this phenomenon? If not, can we actually fill up the whole universe with photons drowning everything in those small elements swishing around?
It's good I missed his stream otherwise I would have asked him about the woman on the floor not asking her colleagues for help in tightening those screws before JWST went into the vibration chamber, and then NASA covering up the billion dollar delay, to avoid a PR nightmare...
@@frasercain Yeah the NASA interview that mr. Bridenstine and Thomas Zurbuchen gave, after the incident. The one with the Nobel astrophysicist, John Mather.
Is this telescope an installment of the Space Force proposed by president Donald Trump? If so is its primary function to protect the Americans if we descover complex alien life forms???
The last Arianne 5 w satellite blew up. What steps are being taken to assure a safe launch given this. I remember the Arianne Director basically said oh sorry, too bad so sad...and the customer lost its investment. I don't buy the track record anymore for an old system designated and used for political means. Its' cost vs billions for the telescope??? This thing blows up and it will be devastating. Someone should have revisited this after the last failure. I don't care how it was designed, things can be re-engineered if the risks are too great.
Always though the Ariane was chosen for its track record According to this interview it was about saving costs.. smh *I'm gonna be very sad but not at all surprised if this thing blows up trying to launch or the screws fall apart while trying to deploy..
Really enjoyed it. It's always good when you hear two techies talk nuts and bolts as opposed to polished sophistication from administrators. :)
Yeah, that was a lot of fun.
Paul Geithner stated at the end of the interview that it was a really humbling to experience how hard challenges can be in developing the JWST . I can imagine how desperate he must have been when they didn't succeed in reaching the 4 degrees Kelvin. It must have looked like that it was impossible to cool something so much in the vacuum of space. I think we must realize how incredible difficult things can be and admire that the JWST is now almost in its final stage of testing. It must have been a hell of a job.
I can only imagine...
Guys, this was awesome. Thank you.
Thanks for joining us!
For the long storage issue, I think we can add that it is "not a problem" because it's designed in. A lot of contractors are military contractors, and they are used to missiles that stay 20 years in storage and have to work reliably only once. So the selection of grease and o-ring is guided by this prior knowledge.
Yeah, that was Paul's opinion too.
Damn, the internet conked out 15 minutes into the interview! Ah, well, I'll watch it in the morning.
Edit: A very interesting interview and good questions.
Thanks for joining us!
Wow, even I'm nervous about this launch and deployment going successfully, I can't imagine how these guys must feel and we're still 15 months away
Yeah, nerves of steel.
When you image using gravitational lensing does it look like anything, or does a computer have to descramble the image first? Great show!
Will we be able to do instant parallax measurements/observations with JWST? Is that a valuable function?
That isn't its intended purpose. I'm sure it could be used for something like that, but it would be a waste of its capabilities.
Since red dwarf/giant stars are so dim will JWST’s infrared be likely to find many more of these objects that are hidden “nearby” or just more farther out?
It has a narrow field of view, so it won't be a great tool for discovering them. But if you know where to look, then it'll reveal them with more detail than any other tool out there.
Hey fraser I'm having trouble understanding the barn pole paradox. How can simultaneous events be relative?
Hey Fraser! Question how do spray aerosols work in space?
The idea occurred to me wondering if we could spray something onto the surface of the moon and it would harden or cause the dust particles to bind together and create a landing pad? Perhaps starship could spray it out as in comes in to land and it reacts with heat to polymerize really quickly. Any thoughts?
I think it's more likely that we'll have the space travel technology & infrastructure to maintain the JWST before the 10 or 14 years come to pass after it is launched. I'm calling it now; I think the JWST will be decommissioned not because it can no longer operate, but only when we have such better telescopes available, it's no longer worth it to keep it operating.
I think that's realistic.
Is there anything special about the origami that is used to fold the shade? Was there an origami expert that was involved in the creation of that system?
Will JWST have relay probes? If not how will it send signals to earth if the sun is blocking the direct path for communication? Thanks
The Earth will be much closer than the Sun, so it'll communicate directly with Earth.
Fraser Cain I see. So it’s not the Lagrange point at parallax position, but one of the closer ones! That explains why it only takes one month to get there! Thanks
Question.
You and many others often mention using water as a shield against harmful radiation for use in deep space flight to protect future astronauts.
Would the water need to be in a liquid state? Would Ice work? Would the water be contaminated and unusable?
Ice or liquid is fine.
Q: Hi Fraser, JWST field of regard is parallel to its sunshield instead of perpendicular to it. Do you know what is the design decision for it? As I think it could have wider angle of view and better protection from the sun light if the field of regard (FOR) were perpendicular to the shield.
It will still be able to gimbal up and down and rotate around, so it'll have more things that it can look at.
PBS Spacetime talked about how in an entropy fluctuation model of the big bang, Boltzmann brains would outnumber observers in full universes, so we should be surprised we aren't Boltzmann brains, and this is an argument against that entropy fluctuation model of the big bang.
This aspect of the anthropic principle confuses me; why shouldn't I then be surprised I'm not an insect, and reject any model of the world where insects far outnumber humans?
Why can’t we use JWST after the He runs out? Can’t it be used as a regular telescope after that?
I actually clarified this with Paul last night. It won't run out of coolant.
@@frasercain Oh, I remember something about that. But, I also remember hearing it could only do science for 10 years.
JWST is passively cooled - other than our MIRI instrument, it is cooled only by virtue of being in the shade. The mitigating factor on its lifetime is actually fuel for stationkeeping (keeping it in its orbit). The mission lifetime is minimum 5 years, but we'll aim for 10+.
@@NASAWebbTelescope Wow, thanks for clearing that up for me. Can't wait for first light!
What if once it powers up and after a month it answers all the known questions we have of the universe?
Then we can pack our things, shut down our computers, take vacation and enjoy ourselves somewhere
I can imagine worse problems to have.
Q: is IT possible to empty a piece of matter from all its photons?
Could we take a small piece of metal for example and heat it and let all the photons leave it so it stop to glow?
If so, how come we do not see this phenomenon?
If not, can we actually fill up the whole universe with photons drowning everything in those small elements swishing around?
How far away from a star going super nova would be lethal for earth?
Within about 100 light-years.
Can JWST be part of the next EHT?
No, it's infrared, not radio. But I'm sure it will make its own observations.
They will be able to service space telescopes with the SpaceX Starship before they become redundant.
Here's hoping.
It's good I missed his stream otherwise I would have asked him about the woman on the floor not asking her colleagues for help in tightening those screws before JWST went into the vibration chamber, and then NASA covering up the billion dollar delay, to avoid a PR nightmare...
Was there a specific story that you're referencing?
@@frasercain Yeah the NASA interview that mr. Bridenstine and Thomas Zurbuchen gave, after the incident. The one with the Nobel astrophysicist, John Mather.
Paul likes his ceiling pot lights! Over-engineered, redundant systems, home lighting for the win!
Hah, yeah, I was noticing that.
A few more yrs and they would have had a bigger rocket.
That'll be the rocket that launches LUVOIR. :-)
the guy on right look alien
Is this telescope an installment of the Space Force proposed by president Donald Trump? If so is its primary function to protect the Americans if we descover complex alien life forms???
No & no.
You question i deranged.
Donald Trump Will activate the rockets and ram the telescope into the alien space ship, to protect the United States, that is the plan
No. But if we did discover aliens, it would be one of the tools that would help understand them better.
The last Arianne 5 w satellite blew up. What steps are being taken to assure a safe launch given this. I remember the Arianne Director basically said oh sorry, too bad so sad...and the customer lost its investment. I don't buy the track record anymore for an old system designated and used for political means. Its' cost vs billions for the telescope??? This thing blows up and it will be devastating. Someone should have revisited this after the last failure. I don't care how it was designed, things can be re-engineered if the risks are too great.
Always though the Ariane was chosen for its track record
According to this interview it was about saving costs.. smh
*I'm gonna be very sad but not at all surprised if this thing blows up trying to launch or the screws fall apart while trying to deploy..
Ariane 5 hasn't blown up in the last 17 years.
@@zapfanzapfan the last launch failed at altitude. Payload lost.
Do you mean Vega?
I don't know anything specific about this, but I'm sure there's been an inquiry into what went wrong with the Ariane 5.
What's a invehrrment? (Lol listen to how he says environment)...