Amara Graps responded:
>"Higher frequency" ? I didn't mention anything about higher frequency.
>(Higher frequency of what?, I should probably ask)
I think he meant that, if a star has a Dyson sphere around it, you
can't see the star in visible light (== higher frequency than
infrared). In fact, you can't see the star at all. You can only see
the infrared light that the Dyson sphere emits.
---As an aside about the "allowing external posters" thread: I'm not subscribed to this list, because I can't afford the time to recieve 50 messages a day. However, I occasionally visit the web site and respond to posts that way. If you only allowed posts by approved members of the list, I wouldn't be able to do that.
Perhaps there should be a list of "allowed posters", separate from (and presumably a superset of) the list of recipients.