Scientific European<p>How Far Human Civilisation is Detectable in Space&nbsp;<br>Earth’s most detectable techno-signatures are the planetary radar transmissions from the erstwhile Arecibo Observatory............<br><a href="https://toot.community/tags/Arecibomessage" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Arecibomessage</span></a> <a href="https://toot.community/tags/AreciboObservatory" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>AreciboObservatory</span></a> <a href="https://toot.community/tags/ETI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ETI</span></a> <a href="https://toot.community/tags/ExtraTerrestrial" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ExtraTerrestrial</span></a> <a href="https://toot.community/tags/Extraterrestrialintelligence" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Extraterrestrialintelligence</span></a> <a href="https://toot.community/tags/SETI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SETI</span></a><br>Umesh Prasad </p><p><a href="https://www.scientificeuropean.co.uk/sciences/space/how-far-human-civilisation-is-detectable-in-space/" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">scientificeuropean.co.uk/scien</span><span class="invisible">ces/space/how-far-human-civilisation-is-detectable-in-space/</span></a></p>