John Gribbin, H.W. Duerbeck's Am Anfang war …: Neues vom Urknall und der Evolution des PDF

By John Gribbin, H.W. Duerbeck

ISBN-10: 3034863705

ISBN-13: 9783034863704

ISBN-10: 3764350059

ISBN-13: 9783764350055

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Additional info for Am Anfang war …: Neues vom Urknall und der Evolution des Kosmos

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Das andere Rätsel betrifft die Bewegung von Galaxien durch den Raum. Galaxien sind zwar zu weit von uns entfernt, als daß man ihre Bewegungen am Himmel messen könnte, doch in der Sichtlinie können sie mittels Spektroskopie aus dem Doppler-Effekt ermittelt werden. In einem Galaxienhaufen sind alle Mitglieder etwa gleichweit von uns entfernt, jede Galaxie hat also die gleiche kosmologische Rotverschiebung, die durch die Expansion des Raumes hervorgerufen wird. Alle Unterschiede in den Rotverschiebungen der Galaxien eines Haufens müssen folglich durch den Doppler-Effekt ihrer wahren Bewegungen durch den Raum hervorgerufen werden.

Bakteriophagen sind kleiner als Zellen, aber chemisch gesehen recht komplexe Strukturen, die nicht lebendig zu sein scheinen, wenn sie isoliert existieren. Sie können aber die Reproduktionschemie einer Bakterie «kapern» und die Maschinerie der Zelle dazu verwenden, weitere Kopien von Bakteriophagen herzustellen, die dann andere Bakterien infizieren können. Bakteriophagen können sich ohne Hilfe nicht selbst fortpflanzen. Sie überleben, wie Haldane feststellte, «große Erhitzung und andere unangenehme Dinge, die die Mehrzahl der Organismen abtöten würden».

34 Die Geburt des Universums Die tiefstmögliche Temperatur, der absolute Nullpunkt der Temperatur, bei dem alle thermische Bewegung der Atome und Moleküle aufhört,liegt bei -273 Grad Celsius, was als null Grad auf der absoluten Temperaturskala, der Kelvin-Skala (K), definiert wird. Die den gesamten Raum erfüllende kosmische Mikrowellen-Hintergrundstrahlung hat eine Temperatur von 2,7 K. Diese Strahlung rührt direkt vom Urknall her und kann mit Hilfe von Radioteleskopen «gesehen» werden. Sie können dem Klang des Urknalls in Ihrem eigenen Heim lauschen.

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Am Anfang war …: Neues vom Urknall und der Evolution des Kosmos by John Gribbin, H.W. Duerbeck

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