15 times larger than any current telescope on Earth, Hubble's mirror is not the largest (though it is orbiting, not ON Earth). Current largest I do not recall but I do believe it is in Chile also
You should consider that the telescope is built in one of the areas with the largest amount and intensity of earthquakes in the world. It is not only to build that tremendous element, it is also to build an adequate infrastructure to maximize the facilities within the most severe conditions in the world. Nature is wise, the best things have a good price
it wont be 15 times sharper , it will 15 times brighter but only a bit sharper, those are different things. The sharpness is proportionnal to the inverse of the diameter, not the surface.
Really congratulations to all people of the ESO observatory to make this fantastic awesome new super observatory for the world. I hope to visit again in the near future, I was there in 2014.
I started reading Burnham's Celestial Handbook recently, and i rather like how he uses _Deep Sky Wonders_ instead of dry _objects_. Splendour of the Heavens, Celestial Wonders, sounds cool!
wasn't JWST supposed to have been launched back in 2014? And they still haven't done it. I assume they that they ran in to some issues. I would figure large telescope out at the L2 point would be able to be more useful than a ground based one - only for the fact that the earth turns and astronomers can only get a brief snapshot of the sky, and also have to compensate for atmospheric disturbances and motion.
@@fn0rd-f5o Yes, everything had worked like it was planed with the JWST it would be already in position, but already since 2007. Currently it is planned to be finished in 2021. That is mostly done by financial issues (planning started about 1996, before the financial crisis), problems with the manufacturing and testing (they are testing it many times, because if there is a bug you can adjust it here, but if i happen in the space, it is lost, and every problem that appears must be solved, and that takes time). You are correct, that the space (or the L2) would be a much better place for the telescope, than the earth surface. But there are some issues, why many telescopes are on the earth' s surface: One part i have already mentioned: is there is something not working properly you can't fix it and the telescope is lost, while on the earth you can most likely fix it (with time); To set a telescope in the space you need to put it in the rocket, so you have a maximum of size, construction and weight to lift it up, inferred telescopes (like the JWST) need to be cooled, for this you need liquid nitrogen or helium (to cool the operational products, so they wont influence the image) but this amount of liquid is limited on the space method, while it is pretty easy to deliver again and again new liquid to the earth based one. These are just some points, while we keep on building telescopes on the surface.
@@leod9442 Measure once, cut twice? oh wait. Measure twice cut once. : ) NASA has probably cut it's funding several times, due to low funding by Congress as well. That's something that will plague the whole industry. I was surprised and not surprised at the same time to read that Rusty Schweickart called NASA out.
So, what do they do when they need to re-aluminize the mirrors? How often will they do that? How long will it take to remove, aluminize, reinstall then align the mirrors?
I suppose they will clean and re-coat one group of mirrors at a time? Each primary mirror segment is only 1.4 meters across, disassembling, transporting, cleaning, re-coating and assembling then back should be much easier than the VLT's 8.2 meter mirror. Also they have whole day when the telescope isn't in operation.
Was ich nicht verstehe warum man auf der Erde so große Teleskope baut und nicht bessere "Hubble" Teleskope ins All schickt? Würde das nicht mehr Sinn machen? Wäre über eine Antwort sehr froh
They have back up generators on site, but they are connected to the national electric grid. They have to be in the middle of nowhere, light pollution makes building them near a city pointless.
Debiera llamarse por lo menos southamerican extremely large telescope, mal que mal prácticamente están en territorio chileno cortando un cerro a la mitad para instalar su telescopio, al menos la cortesía de poner el nombre del lugar que les generará dinero, fama y conocimiento. PD, No soy amargado ni nada, solo considerado con lo que la tierra es capaz de darnos.
Buen reportaje ... Pero Decepcionado ... No hay subtitulos en español , para mis hijos. Saludos desde el pais donde que estará el telescopio y que habla español como casi toda Latinoamérica. Que falta de respeto...
Tampoco hay traducción al sueco o danés, aunque estos son estados miembros de el ESO. Por qué ? debido a que las traducciones no las hace el ESO, probablemente las hicieron y las propusieron las personas que vieron el video. Si hay una falta de respeto, solo puede ser que nadie que hable español (y sueco y danés) se moleste en hacer una traducción. Es un poco fácil culpar a los demás.. . Perdón por los posibles errores, no es mi lengua materna.
@European Southern Observatory (ESO) What do i need to do to get a job there? I didn't go to college, but i am a very smart man! One more thing - if i decide to never go back home, can i sleep there under the telescope and watch the sky all the time? :)))
The important thing is not what you can or cannot do, the important thing is to dream about doing it. So I would say that you can sleep in the desert, looking at the sky, seeing the stars in the galaxies, imagining other forms of life, other types of places, however ... Always the same universe.
Surely a much smaller telescope built in space would provide many times better images? Ok cost getting it up there might be a bit high but you wouldn’t need all the ground works, dome and gravity working against you?
This costs under 1.5B€ (fingers crossed, but it should) and see first light in 2021, construction officially started 2017. JWST is going to cost at least 10B$, hopefully gets launched 2021, has been in development since 1997 and is outright going to lose out in resolution and light gathering power. So apples to apples, if you could have one or the other, you go with ground based telescope every time. But there are some things JWST will be able to do ground based telescopes just can't, it can see frequencies that are blocked by atmosphere and the entire thing is under cryogenic temperatures, that makes for some excellent image quality. Oh and space telescopes get near enough 24/365 observation time so there is that. It used to be that you just couldn't build ground based telescopes this big, without adaptive optics E-ELT could never work. For example, back when Hubble was launched adaptive optics were science fiction or perhaps top secret spy satellite tech. The largest telescope in the world was Soviet BTA-6 at 6m diameter and that did not give nearly as good pictures and the aperture alone would suggest. E-ELT will be 39m primary and it'll operate close to what the aperture would suggest. That's the giant leap made possible by adaptive optics. You just can't beat it with space telescopes, not now anyway, space is for observations you just can't do from the ground at all.
Yes as others have noted I will add that you really talking about JWT. Anything larger then that would face major funding hurdles even more intense then what the JWT faced.
It doesn't, photon is not a billiard ball. Energy of a photon is it's frequency times Planck's constant, reflection off of a stationary mirror doesn't change it's wavelength, therefore energy of the photon stays constant. Light beam as a whole though does lose energy with every reflection, because some photons do not reflect but get absorbed instead.
This is the best one billion dollars project ever, instead of building atomic bombs. " the stars are there to indicate where is the finish line is " Chinese proverb.
Adaptive optics has its limits. The telescope will not be able to achieve anywhere near the Rayleigh criterion. The fact is, it really won't be any better than other Earth based adaptive optics telescopes. Basically it's just a bigger light bucket for shortening exposure times. The advantages of this telescope over somewhat smaller AO telescopes is very small. It's mostly about bragging rights and politics. What we really need are MORE moderately large telescopes, not ultra expensive gigantic ones. Availability of telescope time is the biggest obstacle to deeper exploration.
You might just be in luck, whatever production line makes all the mirrors for this mega project probably isn't going to shut down just because it gets completed.
