Unter dem Kreuz des Südens
Dieses Foto, das während der Ultra High Definition Expedition zum La-Silla-Observatorium der ESO in Chile entstand, zeigt das dänische 1,54-Meter-Teleskop wie es fast staunend den prächtigen Südhimmel betrachtet. Das Kreuz des Südens – eine der bekanntesten Sternkonstellationen – steht links von der Teleskopkuppel, eingebettet in das Band der Milchstraße.
Das Sternbild Kreuz des Südens (Crux) erkennt man leicht an der kreuzförmigen Anordnung der vier Hauptsterne – Alpha, Beta, Gamma and Delta Crucis. Der nächste dieser Sterne, Gamma Crucis, ist nur 88 Lichtjahre von der Erde entfernt, während den weitesten 364 Lichtjahre von uns trennen. Der blau-weiße Stern Alpha Crucis, der Stern am Fußpunkt des Kreuzes, ist der 13. hellste Stern am gesamten Nachthimmel.
Der dunkle, fast schwarze Fleck direkt über dem Kreuz des Südens ist der Kohlensack, eine der bekanntesten und mit bloßem Auge sichtbaren Dunkelwolken. Diese lichtundurchlässige Wolke aus interstellarem Staub verhüllt das Licht der dahinterstehenden Sterne und erzeugt so eine scheinbar sternenlose Leere inmitten der Milchstraße. Den glühendrote Emissionsnebel IC 2948 und den unverwechselbare Carinanebel sieht man unterhalb des Kreuzes des Südens als zwei nebelige Flecken.
Das Kreuz des Südens spielt auf der Südhalbkugel der Erde eine bedeutende Rolle. So wie der Große Wagen auf der Nordhalbkugel diente es über Jahrhunderte den Seefahrern als Navigationshilfe, da der lange Balken des Kreuzes fast genau zum Himmelssüdpol zeigt. Das Kreuz des Südens hat auch einen wichtigen Platz in den religiösen Mythen vieler südlicher Kulturen. Und nicht zuletzt es ist auch im Logo der Europäischen Südsternwarte enthalten.
Herkunftsnachweis:ESO/B. Tafreshi
Über das Bild
| ID: | potw1832a |
| Sprache: | de |
| Typ: | Fotografisch |
| Veröffentlichungsdatum: | 6. August 2018 06:00 |
| Größe: | 6144 x 4096 px |
Über das Objekt
| Name: | Danish 1.54-metre telescope |
| Typ: | Unspecified : Technology : Observatory : Telescope |
Bildformate
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