1.1.1. Blackholes
Blackholes are the end result of the gravitational collapse of sufficiently massive stars. When the mass is inside the gravitational radius an event horizon forms which is the effective surface of the hole. Any probe moving at the speed of light or less is trapped inside the event horizon surface of the hole. All such unfortunate objects are crushed out of existence in a finite amount of real proper time. If you are an observer at a fixed distance from the hole you will not be able to see the probe actually reach the event horizon. The signals from the probe to your star ship get infinitely red shifted to zero frequency as the probe approaches the event horizon because time is slowing down more and more as the distance to the surface decreases. If you try to hover at a fixed distance by firing your engines above the event horizon the tidal forces will crush you as you slowly try to inch your way closer to the horizon surface. In contrast, if you shut off your engines and freely fall you can go through the surface without being crushed there. But you will get crushed shortly after by the singularity inside the horizon.
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