Read e-book online Das Hubble-Universum: Neue Bilder und Erkenntnisse PDF

By Daniel Fischer, Hilmar Duerbeck

ISBN-10: 3034862016

ISBN-13: 9783034862011

ISBN-10: 3034862024

ISBN-13: 9783034862028

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Extra resources for Das Hubble-Universum: Neue Bilder und Erkenntnisse

Sample text

Wenn es nachts dunkel wird, so beweist dies letztlich, daß das Universum einen Anfang vor endlicher Zeit hatte. Wären doch nur alle kosmologischen Erkenntnisse so «offensichtlich»! Hubbles Blick war nun tiefer in den Kosmos vorgedrungen als der jedes anderen Astronomen zuvor; tief bedeutet hier: hin zu immer schwächer leuchtenden Himmelsobjekten. Nur ein paar Sterne unserer Milchstraße sind zu erkennen, ihre Zahl wird von der Zahl entfernter Galaxien bei weitem übertroffen- das hellste Objekt ist ein mit Beugungsspitzen versehener Stern etwa 20.

Wie sieht nun der Blick in die Tiefen des Alls aus? Wie sähe ein ewig andauerndes Universum aus, unendlich ausgedehnt und überall mit leuchtender Materie (Sternen oder Galaxien) erfüllt? Diese Frage wurde schon früh gestellt, und der Bremer Arzt und Hobbyastronom Heinrich Wilhelm Olbers gab 1823 bereits eine treffende Antwort darauf: Der Nachthimmel müßte strahlend hell sein, denn irgendwann müßte der Sehstrahl des irdischen Beobachters an jedem Fleck des Tausende von Galaxien und eine Handvoll Sterne im Hubble Deep Field - einem Gebiet von einem Dreißigste!

Bereits bei der nächsten Service-Mission Anfang 2000 könnte nämlich Hilfe kommen: Es erscheint möglich, der Kamera ein zusätzliches, aktives Kühlsystem zu verpassen, so daß ihre Lebensdauer im Prinzip ins Unendliche verlängert wäre. Um den Stickstoffblock vor dem Start im gefrorenen Zustand zu halten, war die NICMOS mit einem Rohrsystem ausgestattet worden, durch das man eisiges Helium schickte. Im Orbit sind diese Rohre nutzlos - aber nichts spricht dagegen, sie wieder mit einem Kühlmittel zu beschicken.

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Das Hubble-Universum: Neue Bilder und Erkenntnisse by Daniel Fischer, Hilmar Duerbeck


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