Hallo ich mache Philosophie, Technik und Gesellschaft.

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Cake day: June 21st, 2024

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  • nah, like, i mean, exponentially more expensive. rocket equation

    as you go faster, you need exponentially more fuel (with chemical rockets). so it gets really expensive really fast.

    you could improve the speed somewhat by switching to electric / nuclear propulsion or by using a solar sail. While electric / nuclear propulsion just increases the effective exhaust velocity, which gives you greater Δv achievable, solar sails fundamentally change the game because they don’t require exhaust to accelerate the spaceship. Instead, any star’s light pushes the ship forward through the pressure that radiation exerts on a surface (thus the name solar sail). Yet while it allows arbitrary maximum speeds, acceleration itself is a very slow process this way, so it might take thousands of years to reach peak speed, which only pays off if you do interstellar travel.



  • my personal opinion is that instant (i.e. arbitrarily close to speed of light) teleportation machines could be built in theory, but doing so is really expensive and there’s just no economical reason to do so.

    for example, for fast travel, we already have aircraft and rockets. Yet nobody would use them to ship objects produced in china to europe, e.g. cars, if there’s no time-critical component (i.e. food that spoils very quickly etc.). So the fastest way of travel is typically also the most expensive one, while cheaper modes of transport take more time.

    Then, you can think of a teleportation device as a mode of transport where the speed approaches the speed of light. If our previous experience is anything to go by, that means that the cost of transport would increase enormously, and thus practically nobody would use it anyways. So that’s the practical side to this thing.