[RadioAstronomer]

True, but it does something else - I can't remember - perhaps it blocks asteroids or affects the magnetic fields which protect us from radiation. Its something like that.

see post #70

[PatrickHenry]

One possible explanation for the "no contact" situation isn't listed in the lead article: technological stagnation. An intelligent bunch of aliens could be frozen for millions of years in ancient-Egypt-like societies. Most human societies have been that way. Such societies can be very stable. It tales a wild technological leap to get to where we are. Perhaps that's what's really rare.

[ZULU]

Thanks.

Are you really a radioastronomer?