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月に置いた携帯電話を地球上の電波望遠鏡で観測すると、太陽系外でもっとも強い電波の天体−−たとえば、白鳥座AとかカシオペアAといった、とても強い電波の天体があるのですが、それよりも明るくなってしまう。それぐらい、宇宙から来る電波は弱いものなのです。
（中略）
その目に見えない、宇宙から来ている電波を受ける装置が「電波望遠鏡」です。
“
— 『ALMA電波望遠鏡 カラー版』（石黒正人／ちくまプリマー新書） (via kazumichimoriyama)
Reblogged 2 years ago from kazumichimoriyama
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