We have no gravity shields. We can't beam ourselves from one location to another. That sounds ridiculous, but about 200 years ago, experts were of the opinion that flight wouldn't exist, even 120 years ago, and if you moved faster than you could run, you would instantly die.
No tenemos escudos de gravedad. No podemos teletransportarnos. Suena ridículo, pero hace 200 años, los expertos opinaban que no se podría volar, incluso hace 120 años, y que si te movías más rápido de lo que podías correr, morirías al instante.