Pieni planeetta vai Erittäin suuri teleskooppi?
Näkyykö kuvassa Tatooine-planeetta ja Millenium Falcon? Itse asiassa tämä viikon kuva esittää maailman suurimman taivaalle katsovan silmän, eli ESO:n Erittäin suuren teleskoopin (ELT) perustuksia! Teleskooppia rakennetaan parhaillaan Cerro Armazonesin huipulla Chilen Atacaman autiomaassa. ELT aloittaa tieteellisen toiminnan vuonna 2027, ja siitä tulee yksi maailman johtavista tähtitieteen tutkimusyksiköistä.
Tämä erikoinen pallomainen kuva on otettu tammikuussa 2022, ja se on tehty stereografista projektiota käyttäen, jossa panoraamakuva projisoidaan yhteen tasoon. Kuvassa näkyy ensimmäiset hahmotelmat ELT:n suuresta pallomaisesta kupolista, jonka sisälle tulee valtava 39m:n pääpeili, eli lyhyesti M1. Peili koostuu 798:sta kuusikulmaisesta segmentistä, ja sitä ohjataan reaaliajassa tarkoilla antureilla, jotta ne pysyvät täydellisesti linjassa. Tätä tekniikkaa kutsutaan aktiiviseksi optiikaksi. Toinen peili (M4) muuttaa muotoaan jopa 1000 kertaa sekunnissa ilmakehän turbulenssin vaikutusten korjaamiseksi. Tätä tekniikkaa kutsutaan adaptiiviseksi optiikaksi, ja sen avulla ELT pystyy ottamaan uskomattoman yksityiskohtaisia kuvia tähtitaivaan kohteista.
Kuvassa myös ELT:n sijaintipaikan eristyneisyys lähikaupunkien aiheuttamasta valosaasteesta tulee hyvin esille. Cerro Armazonesin-tasanko sijaitsee 3000 metrin korkeudessa ja siellä on yli 320 pilvetöntä yötä vuodessa. Nämä tekevät siitä ihanteellisen paikan avaruuden tarkkailuun. Haluatko nähdä, miten rakentaminen edistyy? Tutustu sitten verkkokameroihimme!
Tämän kuvan muut versiot:
Oikeudet:G. Hüdepohl (atacamaphoto.com)/ESO
Kuvasta
| Tunnistus: | potw2215a |
| Kieli: | fi |
| Tyyppi: | Valokuvallinen |
| Julkaisupäivä: | 11. huhtikuuta 2022 6:00 |
| Koko: | 12466 x 12466 px |
Kohteesta
| Nimi: | Extremely Large Telescope |
| Tyyppi: | Unspecified : Technology : Observatory |
Kuvaformaatit
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