Astronomers have likened the visible region of the electromagnetic spectrum--which stretches ... built by astronomers at the Harvard College Observatory and the closely associated Smithsonian ...
Chandra X-ray Observatory, and XMM-Newton to survey the distant universe to the faintest flux limits across the electromagnetic spectrum. These were the most advanced space-borne observatories at the ...
If an extraterrestrial civilization existed with technology comparable to ours, would they be able to detect Earth?
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