Ask Ethan: Could SETI detect an Earth-like civilization? - by StartsWithABang
or even arrays of radio telescopes on the Moon: a serious proposal with tremendous benefits. But — just like direct imaging of Earth-sized exoplanets, using transit spectroscopy to measure the atmospheres of potentially Earth-like worlds, or endeavors to engage in interplanetary paleontology within our Solar System to dig up ancient organisms — these endeavors are all looking ahead to the future.
This image of the Very Large Array in the southwestern United States highlights the importance of arrays of radio dishes in measuring many different properties of our Universe, including searching for potential extraterrestrial signals that were created by an intelligent species. But there have been military transmissions that do have the right power and frequency characteristics to be detected over hundreds of light-years: the radar transmissions thatto detect any incoming ballistic missiles.
Travel the Universe with astrophysicist Ethan Siegel. Subscribers will get the newsletter every Saturday. All aboard! What about the most compelling signal we’ve ever detected? Could that have come from intelligent aliens? Maybe. But a more mundane explanation is that a collection of hydrogen atoms, moving at about 10 km/s with respect to us, emitted this signal, and then stopped. We don’t know why it would cease, but all follow-up attempts have failed to see any sources or signals of note in the same region of space.
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