You make it sound like tethering in space is a solved problem – it isn&#x27;t: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Space_tether_missions" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Space_tether_missions</a><p>Reliable reeling mechanisms that actually work in vacuum seem a yet unsolved problem, and there&#x27;s occasional research into it. Sure, there could be more, but it&#x27;s not like the lack of gravity is the only (medical) problem to solve for a Mars flight.