Schwimmender Mond
Dieses Fotomosaik zeigt einen ganz vertrauten Himmelskörper – den Mond – in einer ganz unvertrauten Art und Weise.
ESO-Fotobotschafter Petr Horálek hat diese Serie aufgenommen, während er am hochgelegenen Paranal Observatorium der ESO in Chile arbeitete, wo der Himmel erstaunlich klar ist. Die Aufnahmen dieses verblüffenden Monduntergangs entstanden dabei in Abständen von je fünf Sekunden und zeigen wie der Mond langsam unter den Horizont sinkt (die Aufnahmen sind chronologisch angeordnet von links nach rechts und oben nach unten).
Die tiefrote Farbe dieser Bild rührt vom Phänomen der atmosphärischen Extinktion. Während sich der Mond dem Horizont nähert, muss sein Licht immer längere Distanzen durch die Atmosphäre zurücklegen, bevor es unser Auge erreicht. Dadurch wird immer mehr Licht gestreut – mit anderen Worten: Das Licht muss durch immer mehr Luft hindurch dringen und wird so immer stärker gestreut. Von allen Farben des sichtbaren Spektrums streut die Atmosphäre rotes Licht wegen seiner größeren Wellenlänge am wenigsten, was Sonnen- und Monduntergängen die charakteristische orangerote Färbung verleiht.
Neben der Farbe fällt in diesen Bildern auch eine deutliche Kräuselung auf – der Mond scheint zu schmelzen! Dies ist wiederum ein atmosphärischer Effekt: Die Lichtstrahlen werden hier von Luftschichten mit unterschiedlicher Dichte, Temperatur, Druck und Feuchtigkeit ungewöhnlich und ungleichmäßig gebeugt. Die Form des Mondes erscheint auch abgeflacht durch die Linsenwirkung der Atmosphäre, welche die unteren Details nach oben zu drücken scheint und so eine ovale Form erzeugt. Diese Phänomene werden alle durch differentielle Refraktion hervorgerufen — im Prinzip wirkt jede Schicht der Erdatmosphäre unterschiedlich auf das Mondlicht ein und dadurch entsteht diese verzerrte Abbildung.
Bildnachweis:P. Horálek/ESO
Über das Bild
| ID: | potw1828a |
| Sprache: | de-ch |
| Typ: | Fotografisch |
| Veröffentlichungsdatum: | 9. Juli 2018 09:00 |
| Größe: | 6760 x 2704 px |
Über das Objekt
| Name: | Moon |
| Typ: | Solar System : Planet : Satellite |
Bildformate
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