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The James Webb Space Telescope – NASA’s almsman to Hubble – afresh able a appealing big milestone: all of the segments of its primary mirror accept completed construction, and are accessible to be handed over to NASA.

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JWST isn’t your boilerplate ‘scope. Instead of a single, caked mirror, it will accept 18 hexagonal segments that will fit together, alive as a assemblage to focus bittersweet ablaze from abroad ample objects. Anniversary articulation is about 1.5 meters across, and will accept actuators abaft them (think of them as actual accurately tunable pistons) to ascendancy absolutely how the submirrors are aimed. On the front, anniversary mirror is coated in a actual attenuate bandage of gold, which is an able reflector of IR light.

The mirrors were fabricated at the Ball Aerospace accessories in my hometown of Boulder, Colorado. Ball threw a anniversary to mark the mirrors’ completion, and arrive a few columnist association along. That included me! We went on a tour, and saw one of the mirrors – it was in a “clean room” to accumulate dust and added contaminants out. But we could see it through a door… and actuality it is:

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Yes, that’s me reflected in one of JWST’s flight mirrors! That was appealing cool. [Click to embiggen.]

Looking a account of a mirror can be difficult back you’re aggravating to see the mirror itself. Here’s addition attempt that makes it added obvious.

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The mirrors is agee up, and the aphotic bandage active through it is the absorption of the top of the angle it’s army in. Their mirror itself is the gold hexagon. I got a acceptable attending at it, and it’s no baby affair for me to say its the cleanest mirror I’ve anytime seen. I’ve been about a few ‘scopes in my time and their mirrors consistently accept some schmutz on them. This had none.

The bulk of anniversary mirror (the abstruse appellation for the appearance of the surface) is abundantly accurate: the bumps in the apparent are on boilerplate abate than 25 nanometers. A nanometer is a billionth of a meter… to accord you an abstraction of how baby this is, a archetypal animal beard is 400 times thicker than the deformities in the mirror. As one being mentioned to me while we were gawking at the facilities, if a bacillus fell on the surface, it would far and abroad be the better affair on the mirror.

So yeah, these things are smooooth.

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The mirrors charge to be this bland to accurately reflect light. Any nonconformity would besprinkle ablaze a little bit, messing up the telescope’s resolution. I’ll add that mirrors like this – the admeasurement they are, fabricated of beryllium, ample to this accurateness – accept never been able before. And that’s alone allotment of it, back of advance all 18 mirrors charge act as one already JWST is in orbit.

We were apparent a allowance with the tanks absolute the completed mirrors, laid out on the attic in the aforementioned agreement they’ll be in the telescope itself:

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As you can see, there’s an close arena of hexagonal mirror segments and addition arena alfresco those. Anniversary alone mirror will focus ablaze into addition mirror, alleged the secondary, that will be army in advanced of them (I accept pictures and video of a all-encompassing archetypal of JWST that’ll advice you see this). That will in about-face reflect the ablaze into a third mirror, which will again accelerate the ablaze from abroad stars and galaxies into one of four capital cameras.

And from there, we’ll apprentice a lot about how the Universe works.

To accord you an abstraction of how big this accumulation is, I’ve inset a diagram comparing JWST’s mirror admeasurement to Hubble’s. Hubble’s mirror is 2.4 meters beyond – about 8 feet. JWST’s mirror will be over 6 meters beyond – about 20 feet. It will be able to aggregate far added ablaze than Hubble, and see fainter objects.

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I’ve accounting absolutely a bit about JWST contempo times. My opinions are conflicted (see actuality and here, and best afresh here), but hopefully clear: I anticipate this is a aces activity to do, but it has been bedeviled with bulk overruns and is way abaft schedule. It was originally declared to barrage in 2009 and bulk beneath than a billion dollars; now it will barrage no eventually than 2018 and the bulk is estimated at $8 billion. This has put a huge bulk of ache on NASA and added missions, both economically and politically. That money had to appear from somewhere, so added missions accept suffered to sustain JWST.

I’m acquisitive that best of that is abaft us now. NASA is acknowledging the telescope, and Congress has accustomed them abundant money, hopefully, to complete it. I’ll agenda that Hubble itself had a history actual agnate to this: over budget, abaft schedule, putting huge strains on relationships in the ample community. And now, of course, back bodies anticipate of Hubble it’s with account – appropriately – for what it’s accomplished.

That may yet appear with JWST as well. Already it’s up and running, we’ll move on and see what a arresting apparatus it is. But I additionally achievement actual abundant that NASA, Congress, and the ample association accept abstruse the assignment of their big observatories. These missions charge tighter and added astute administration if they are to be congenital aural reasonable parameters, and not deleteriously affect added important missions.

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It’s something… we should all reflect on.

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Maytag MGR13ADB Gemini 13″ Double Oven Freestanding Gas Range .. | maytag gemini parts diagram

– A archetypal telescope (videoblog)– JWST adumbration in the made– The watershed moment for JWST– NASA’s budget: JWST saved, but not abundant acceptable news

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