ELT

reuters.com
Construction begins on world's largest telescope in Chilean desert
The dry atmosphere of the Atacama provides as near perfect observing conditions as it is possible to find on Earth, with some 70 percent of the world's astronomical infrastructure slated to be located in the region by the 2020s.

Construction began in Chile on Friday on the European Extremely Large Telescope, which when completed will be the world’s largest optical telescope, some five times larger than the top observing instruments in use today.

The size of the ELT has the potential to transform our understanding of the universe, say its backers, with its main mirror that will measure some 39 meters (43 yards) across.

Located on a 3,000 meter-high mountain in the middle of the Atacama desert, it is due to begin operating in 2024.

Among other capabilities, it will add to and refine astronomers’ burgeoning discoveries of planets orbiting other stars, with the ability to find more smaller planets, image larger ones, and possibly characterize their atmospheres, a key step in understanding if life is present.

“What is being raised here is more than a telescope. Here we see one of the greatest examples of the possibilities of science,” said Chilean President Michelle Bachelet in a speech to mark the beginning of construction at the site.

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Every Little Thing 17

Summary: Are the reader and Jensen finally getting back on track?

Characters: Reader, Jensen, Cali

Word Count: 1360

Warnings: Fluff… Smut (poorly written)

A/N:  I’m so sorry I haven’t been writing as much lately, I’ve been going through some personal stuff lately and I’ve hit a massive writer’s block wall. As always this is a work of fiction and I mean no disrespect to Daneel or their beautiful family! All feedback is appreciated!! 

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PART SIXTEEN

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10

Journal 3 shitpost doodle dump part 2! (Part 1 is over here and part 3 is over here)

To be honest, I don’t think I’m done yet. There’ll probably be a part 3 as well because there’s just so much more I want to poke fun of. This book truly is the gift that keeps on giving.

Qeb yfddbpq jvpqbov fp elt Afmmbo zlria obxa qefp glrokxi xka pqfii qefkh qeb Xrqelo txp x zlli drv.

Ezt most fotózta valaki az ELTE Lágymányosi Campuson. Eszerint több kurzust is tartok az új gender-árnyékképzésen. A legbüszkébb a ‘Hónalj- és fanszőrzet fonás’ szemináriumra vagyok.

Every Little Thing part 16

Summary: Fall out from the car accident still looms over the reader and Jensen.

Characters: Reader, Jensen, Cali, mentions of Jared, Misha, JJ & Daneel

Word Count: 1,032

Warnings: Mentions lost of a child, self loathing, guilt, angst, Awesome- Fluffy Jensen

A/N: Sorry it is taking so long to post new parts. I took my last final today so I should have more time to write!  As always this is a work of fiction and I mean no disrespect to Daneel or their beautiful family! All feedback is appreciated!!

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PART FIFTEEN

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This Is Why I Don’t Have Friends

Ah, the good old “I am a professor at a Korean college” thing when you’re actually just an English instructor (like me), so then you ask the guy where he got his Ph.D. and what his research interests are and he hates you forever.

This has happened multiple times and I never get tired of it.

2

Secondary Mirror of ELT Successfully Cast

The casting of the secondary mirror blank for ESO’s Extremely Large Telescope (ELT) has been completed by SCHOTT at Mainz, Germany. The completed mirror will be 4.2 metres in diameter and weigh 3.5 tonnes. It will be the largest secondary mirror ever employed on a telescope and also the largest convex mirror ever produced.

ESO’s 39-metre Extremely Large Telescope (ELT) will be the largest telescope of its kind ever built when it achieves first light in 2024. A new milestone has now been reached with the casting of the telescope’s secondary mirror (M2), which is larger than the primary mirror of many of today’s research telescopes.

The mirror blank is the cast block of material — in this case Zerodur® glass-ceramic [1] — that will then be ground and polished to produce the finished mirror. In January 2017, ESO awarded SCHOTT the contract to manufacture the M2 mirror blank (eso1704). ESO has enjoyed a fruitful collaboration with SCHOTT, who also produced the 8.2-metre meniscus main mirrors for the Very Large Telescope at ESO’s Paranal Observatory (ann12015). A manufacturer of exceptional astronomical products to a very high standard, SCHOTT has already delivered the blanks of the deformable thin shell mirrors that will make up the ELT’s quaternary mirror, M4 (ann15055), and will also provide the blank of the tertiary M3 mirror.

The blank of the secondary mirror now has to go through a slow cool-down, machining and heat treatment sequence over the next year. It will then be ready to be ground to precisely the right shape and polished. The French company Safran Reosc will carry this out, along with additional testing (ann16045). The blank will be shaped and polished to a precision of 15 nanometres (15 millionths of a millimetre) across the entire optical surface.

When completed and installed, the M2 mirror will hang upside down above the telescope’s huge primary mirror and forms the second element of the ELT’s novel five-mirror optical system. The mirror is strongly curved and aspheric and is a major challenge to make and test.

Notes


[1] Originally developed for astronomical telescopes in the late 1960s, Zerodur® has almost no thermal expansion even when subjected to large temperature fluctuations, is highly chemically resistant, and can be polished to a high standard of finish. Many telescopes with Zerodur® mirrors have been operating reliably for decades, including ESO’s Very Large Telescope in Chile.

More information

ESO is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive ground-based astronomical observatory by far. It is supported by 16 countries: Austria, Belgium, Brazil, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Poland, Portugal, Spain, Sweden, Switzerland and the United Kingdom, along with the host state of Chile. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world’s most advanced visible-light astronomical observatory and two survey telescopes. VISTA works in the infrared and is the world’s largest survey telescope and the VLT Survey Telescope is the largest telescope designed to exclusively survey the skies in visible light. ESO is a major partner in ALMA, the largest astronomical project in existence. And on Cerro Armazones, close to Paranal, ESO is building the 39-metre Extremely Large Telescope, the ELT, which will become “the world’s biggest eye on the sky”.


TOP IMAGE….ELT secondary mirror blank successfully cast— Opening of the ELT M2 ZERODUR® blank mould containing the still very hot ZERODUR® glass at first annealing at the SCHOTT 4-metre blank annealing facility in Mainz, Germany in May 2017. The completed mirror will be 4.2 metres in diameter and weigh 3.5 tonnes. It will be the largest secondary mirror ever employed on a telescope and also the largest convex mirror ever produced. Credit: SCHOTT/ESO

CENTRE IMAGE….ELT secondary mirror blank in the streets of Mainz— Transfer of ELT secondary mirror blank to the SCHOTT 4-metre blank annealing facility in Mainz, Germany in May 2017. The blank was cast out of ZERODUR®, a material originally developed for astronomical telescopes in the late 1960s. Zerodur® has almost no thermal expansion even when subjected to large temperature fluctuations, is highly chemically resistant, and can be polished to a high standard of finish. Credit:
SCHOTT/ESO

LOWER IMAGE….ELT secondary mirror blank during transport— Loading the still glowing hot cast ELT M2 ZERODUR® blank onto a truck trailer at SCHOTT melting facility in Mainz, Germany in May 2017. It was then transported at walking-pace through Mainz with a police and fire escort, and arrived safely at the SCHOTT annealing facility, ready to slowly cool and be shipped by boat to France for shaping and polishing. Credit:
SCHOTT/ESO

Nincs jobb a magyar bloggereknél :D

Az egyik épp Párizsban van és a Garnier fizetett neki egy posztért cserébe - a kikötés annyi volt, hogy gránátalma is legyen a képen, mert az új cuccuk gránátalmás. A csaj így oldotta meg.

A gond ezzel, és többen szóvá is tették: ez egy netről lopott kép, amin eredetileg avokádók vannak, az almát ő PS-elte oda :DD

Every Little Thing part 14

Summary: After an amazing holiday nothing can come between Y/N and Jensen, right?

Characters: Reader, Jensen, Cali, Jared, Gen, mentions of JJ & Daneel

Word Count: ~1,800

Warnings: Lots of fluff then some Angst, mentions of cheating and a surprise.

A/N: Time line is all off, I know, I’m sorry just works better like this. This isn’t one of my favorite chapter but I needed to post it.  I am also really tired and haven’t had time to revise so please forgive and errors.  As always this is a work of fiction and I mean no disrespect to Daneel or their beautiful family! All feed back is appreciated!!

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PART THIRTEEN 

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