[Physicist]

Does the earth emit X-rays?

More precisely, it reflects them. I don't know what the Earth's albedo is in that frequency range, however, so I can't tell you how far away we'd be able to see an Earthlike planet with MAXIM. But what it shows is that with interferometry, you don't need a gigantic telescope to get awesome resolving power.

[biblewonk]

Yes, the Kecks were set up for just that purpose. Considering what kind of intruments it takes just to detect an entire earth sized planet, why do you suppose people think that we could aim some crummy little 100 meter radio scope at such a planet and hope to hear their infant monitors and TV communications, or even a 100 meter radio telescope aimed at us tranmitting 10,000 watts?