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A Brief History of Time (Updated and Expanded 10th by Stephen Hawking

By Stephen Hawking

A landmark quantity in technology writing via one of many nice minds of our time, Stephen Hawking’s e-book explores such profound questions as: How did the universe begin—and what made its commence attainable? Does time consistently circulation ahead? Is the universe unending—or are there obstacles? Are there different dimensions in house? what's going to occur whilst all of it ends?

Told in language all of us can comprehend, A short heritage of Time plunges into the unique nation-states of black holes and quarks, of antimatter and “arrows of time,” of the large bang and a much bigger God—where the probabilities are wondrous and unforeseen. With intriguing photographs and profound mind's eye, Stephen Hawking brings us towards the final word secrets and techniques on the very center of creation.

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Extra info for A Brief History of Time (Updated and Expanded 10th Anniversary Edition)

Example text

La parabola ha il compito di focheggiare il fascio di onde radio su uno Yagi, o altro tipo di antenna, posto nel fuoco, che lo invia al ricevitore. Un esempio è il paraboloide di l O metri di diametro, situato a Basovizza, nella succursale dell'Osservatorio triestino, e usato per misurare le emissioni radio solari a lunghezze d'onda di qualche metro (fig. 17). Come per i telescopi ottici, la superficie del paraboloide per onde radio non si deve discostare dalla superficie parabolica ideale più di un ottavo della lunghezza d'onda delle radiazioni osservate.

E una lente convergente L li fa convergere nel suo piano focale. dove si osservano tante immagini della fenditura quanti sono i colori. e cioè lo spettro S. Questo può essere osservato direttamente a occhio nudo o fotografato. 1. Storia dell'astronomia 27 Un quinto tipo è simile al quarto, ma include bande che oggi sappiamo essere dovute a composti del carbonio. Secchi, inoltre, raggruppò in un tipo «assai bizzarro e vario», come scrive lui stesso, tutte quelle stelle che oltre alle righe scure presentavano anche righe brillanti.

Quindi, se i nostri occhi fossero sensibili alle onde radio, potremmo vedere, sia di notte che di giorno, il cielo dominato non dalle stelle o dal Sole - come quando guardiamo a occhio nudo- bensì da galassie e nubi di gas che a occhio nudo non si vedono. Nell'infrarosso si sono individuate galassie insignificanti in ottico e molto intense nell'infrarosso; coi raggi X si osservano stelle debolissime a occhio nudo e fortissimi emettitori di raggi X; nel dominio dei raggi gamma si è scoperto solo recentemente che i responsabili di improwisi lampi, della durata da pochi secondi a qualche minuto, sono delle stelle esplodenti situate in lontane galassie.

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