Spaceflight 🚀<p>The <a href="https://spacey.space/tags/Arecibo" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Arecibo</span></a> message* could be detected up to about 12,000 light-years away from the Earth which is nearly halfway to the galactic centre (the <a href="https://spacey.space/tags/MilkyWay" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>MilkyWay</span></a> 🌌 is 105,700 light-years in diameter and the <a href="https://spacey.space/tags/SolarSystem" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SolarSystem</span></a> is 26,000 light-years from the galactic centre). However, since Arecibo message was broadcasted in 1974, it has travelled only about 50 light-years 📏 so far <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><p>* The message was aimed at <a href="https://spacey.space/tags/Messier13" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Messier13</span></a>, about 25,000 light years from Earth <a href="https://en.wikipedia.org/wiki/Arecibo_message" rel="nofollow noopener noreferrer" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Arecibo_</span><span class="invisible">message</span></a></p><p><a href="https://spacey.space/tags/SETI" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SETI</span></a></p>