Re:First Evidence of a Planet in Another Galaxy
by enkid on Friday September 25, 2020 @10:38PM
(#24595995)
IIRC, we wouldn't be able to pick up our own broadcasts from Alpha Centauri because of the loss of radio transmission power. I doubt we would know if an alien civilization was transmitting at us, even if it was trying to get our attention.
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Re:First Evidence of a Planet in Another Galaxy
by sjy on Saturday September 26, 2020 @02:44AM
(#24596899)
The Breakthrough Listen initiative claims that it is sensitive to “Earth-leakage” levels of radio transmission from all 43 stars within 5 parsecs: https://breakthroughinitiatives.org/news/3
Re:First Evidence of a Planet in Another Galaxy
by notsuoh on Friday September 25, 2020 @10:51PM
(#24596038)
Attenuation of radio waves (long membrane) is way too high, that's true, but radio isn't the only way to transmit that we could theoretically pick up. Gravity waves for example would be a way to transmit across the whole universe.
Re:First Evidence of a Planet in Another Galaxy
by enkid on Friday September 25, 2020 @11:05PM
(#24596096)
Gravity waves would still have similar issues. The only gravity waves we can pick up right now are from extremely dense bodies colliding with each other. Not exactly a feasible means for intergalactic communication.