Stjernespor på himlen
Selvom dette billede som udgangspunkt kan ligne abstrakt moderne kunst, så er det faktisk resultatet af en langtidseksponering af nattehimlen over Chajnantor-højsletten i de chilenske Andesbjerge. Mens Jorden roterer mod endnu en dag, bliver Mælkevejens stjerner over ørkenen trukket ud til farverige spor. Imens får det højteknologiske teleskop i forgrunden næsten en drømmeagtig karakter.
Dette tryllebindende billede er taget 5000 meter over havniveau på Chajnantor-højsletten, der er hjemsted for teleskopet Atacama Pathfinder Experiment (APEX), som ses her. APEX er et teleskop med en diameter på 12 meter, der samler lys med bølgelængder i millimeter- og submillimeter-området. Astronomer bruger APEX til at studere en bred vifte af forskellige objekter fra kolde skyer af gas og kosmisk støv, hvor nye stjerner bliver født, til nogle af de tidligste og fjerneste galakser i Universet.
APEX er stifinder for Atacama Large Millimeter/submillimeter Array (ALMA), der er et revolutionerende teleskop som ESO i samarbejde med internationale partnere bygger og driver, ligeledes på Chajnantor-højsletten. Når ALMA er færdigbygget i 2013, vil det bestå af 54 antenner med en diameter på 12 meter og yderligere 12 antenner på syv meter i diameter. De to teleskoper supplerer hinanden: Takket være sit større synsfelt kan APEX finde mange mål over store områder af himlen, som ALMA så kan studere i stor detalje med sin langt større opløsningsevne (evnen til at skelne detaljer). APEX og ALMA er begge vigtige værktøjer for astronomerne til at lære mere om, hvordan Universet virker, herunder dannelsen af de stjerner, der trækker spor på himlen på dette billede.
Billedet er taget af ESOs fotoambassadør Babak Tafreshi. Han er også grundlægger af The World At Night, et projekt, der vil skabe og udstille en samling af fantastiske billeder og tidsforkortede videoer af verdens smukkeste og historiske steder set mod en natlig baggrund af stjerner, planeter og astronomiske begivenheder.
APEX er et samarbejdsprojekt mellem Max-Planck Institut für Radioastronomie (MPIfR), Onsala Space Observatory (OSO) og ESO. Driften af APEX på Chajnantor varetages af ESO. ALMA er en international astronomifacilitet og et partnerskab mellem Europa, Nordamerika og Østasien i samarbejde med Chile. ESO er den europæiske parter i ALMA-projektet.
Links
Kilde:ESO/B. Tafreshi (twanight.org)
Om billedet
| Id: | potw1250a |
| Sprog: | da |
| Type: | Foto |
| Udgivelsesdato: | 10. december 2012 10:00 |
| Størrelse: | 5995 x 3855 px |
Om objektet
| Navn: | Atacama Pathfinder Experiment |
| Type: | Milky Way : Sky Phenomenon : Night Sky : Trail Unspecified : Technology : Observatory : Telescope |
Mounted Image
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