"We could look for beacons." "It could be that there are alien civilizations that have simply created something a little bit like a lighthouse that sweeps the plane of the galaxy, goes bleep, and it's there to attract attention, or it's a monument, or an aesthetic symbol or even a religious symbol.

VOA: standard.2010.04.16

The Hitchhiker's Guide to the Galaxy and the sequels to that.

如,银河系漫游指南以及其续集

耶鲁公开课 - 死亡课程节选

The Hitchhiker's Guide to the Galaxy and the sequels to that.

如,银河系漫游指南以及其续集

耶鲁公开课 - 死亡课程节选