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Frasi di James Van Allen

James Alfred Van Allen è stato un fisico statunitense.

Fu lo scopritore delle cinture radioattive che circondano la Terra e che dal suo nome sono chiamate fasce di Van Allen.

Egli ne dedusse l'esistenza sulla base dei dati trasmessi nel 1958 dall'Explorer I, il primo satellite artificiale americano.



Le fasce di Van Allen sono formate da particelle subatomiche elettricamente cariche che, provenendo dalle radiazioni solari e cosmiche, restano intrappolate nel campo magnetico terrestre o magnetosfera.

La scoperta di queste cinture radioattive fece temere che il loro attraversamento fosse molto pericoloso per gli astronauti: si pensò di far passare le astronavi sopra i Poli , oppure adottare pesanti schermature.

Ulteriori ricerche dimostrarono che tale pericolo era stato sopravvalutato; e infatti gli astronauti hanno sempre attraversato - pur con le dovute cautele - le cinture radioattive.

Van Allen fu responsabile scientifico di 24 sonde spaziali comprese le Pioneer 10 e Pioneer 11.

✵ 7. Settembre 1914 – 9. Agosto 2006   •   Altri nomi James van Allen
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James Van Allen: 6   frasi 0   Mi piace

James Van Allen: Frasi in inglese

“As soon as we started looking at them, we saw the most remarkable situation. My first thought was, "Great guns! Something's gone wrong with the apparatus!" But then we got later North American tapes and everything seemed normal again.”

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James Van Allen

On the first results from Explorer I, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

“I was a kind of a one-man army. I could solder circuits together, I could turn out things on the lathe, I could work with rockets and balloons. I'm a kind of a hybrid between an engineer and a physicist and astronomer.”

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James Van Allen

On his early career, "Grounded in Space Science", Interview with Rushworth M. Kidder, The Christian Science Monitor, page 14, December 22, 1989.

“After a vast research program, which depended very heavily upon the use of a number of highspeed computers, I am pleased to offer you the result: "Space is that in which everything else is." In other words, "Space is the hole that we are in."”

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James Van Allen

On the definition of space: Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

“A man is a fabulous nuisance in space right now. He's not worth all the cost of putting him up there and keeping him comfortable and working.”

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James Van Allen

On men in space, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

“All this is very good in theory, but in practice, you take a piece of iron, wind a wire around it, then plug the wire in. The core gets hot, the wires smoke, and the fuse blows. So you see, there are practical limitations to theory.”

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James Van Allen

Comments to an undergraduate physics class about transformers, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

“Apparently, something happens on the sun. It sends out a burst of gases. The reservoirs above our earth shake like a bowl of jelly. The radiation droozles out at the ends and makes the auroral displays at the North and South Poles.”

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James Van Allen

On the aurora, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.

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