Spaceflight 🚀<p>The first operational <a href="https://techhub.social/tags/optical" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>optical</span></a> <a href="https://techhub.social/tags/communication" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>communication</span></a> line arrived in 📆1792, covering <a href="https://techhub.social/tags/France" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>France</span></a> 🇫🇷 with a network of 556 stations stretching a total distance of 4,800 km <a href="https://en.wikipedia.org/wiki/Optical_communication#Semaphore_line" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Optical_</span><span class="invisible">communication#Semaphore_line</span></a></p><p>Picture : <a href="https://techhub.social/tags/NASA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NASA</span></a>'s <a href="https://techhub.social/tags/Mars" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mars</span></a> <a href="https://techhub.social/tags/Telecommunications" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Telecommunications</span></a> <a href="https://techhub.social/tags/Orbiter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Orbiter</span></a> * <a href="https://commons.wikimedia.org/wiki/File:PIA07499.jpg" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">commons.wikimedia.org/wiki/Fil</span><span class="invisible">e:PIA07499.jpg</span></a></p><p>* successor : Key features <a href="https://techhub.social/tags/SolarElectric" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SolarElectric</span></a> <a href="https://techhub.social/tags/IonDrive" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IonDrive</span></a> engines, broadband <a href="https://techhub.social/tags/LaserCommunication" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LaserCommunication</span></a> (optic communication) between <a href="https://techhub.social/tags/Earth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Earth</span></a> and <a href="https://techhub.social/tags/Mars" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Mars</span></a> <a href="https://en.wikipedia.org/wiki/Next_Mars_Orbiter" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Next_Mar</span><span class="invisible">s_Orbiter</span></a></p>