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ダイソン球その2

 ダイソン球の続き。

 ダイソン球の内側に住むには、いくつかの問題がある。

1)重力
 ダイソン球の中では、重力は内側(太陽の側)に働く。
 地球の重力に比べれば小さなものだが、何かにつかまっていない限り、すこしづつ太陽に向かって落ちていく。
 ダイソン球を回転させ、遠心力で重力を作る方法もあるが、それでは緯度により、ダイソン球の重力が異なってしまう。

2)強度
 ダイソン球をささえるには、とんでもない強度が必要になる。

3)バランス
 ダイソン球は太陽を中心に置くことで、微妙なバランスを保っている。
 少しでもバランスがくずれると、ダイソン球は崩壊するかもしれない。

 逆にいうと、重力がなんとかできて、強度とバランスを保つオーバーテクノロジーができれば、ダイソン球の内側に住むことができる。

 閑話休題

 ダイソン球は、いかに殻を薄くつくるにしても、膨大な量の材料が必要になることは、想像に難くない。
 しかし物の本によると、木星とか、土星とか、太陽系にある惑星だけで、なんとか厚さ数mの殻を造ることは、できるらしい。
 ただし、これに「1気圧の大気」をつけようとすると、勘定が足りなくなるのではないだろうか。

 重力や大気をなんとかするために、「二重構造のダイソン球」というアイデアが考えられた。
 人間はダイソン球とダイソン球の隙間に住む。
 これなら空気も何とかなるし、太陽の中心に落ちることもない。

 でもやはり、住むなら内側だよな、とか、思ったりするのである。

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SF科学用語辞典」カテゴリの記事

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