I think a truer understanding of gravity and how to manipulate and use it is the key to serious space travel.
Supposedly nothing can move faster than the speed of light but gravity can overcome it. In the case of black holes I begin to wonder if there is a speed of gravity.
“In the case of black holes I begin to wonder if there is a speed of gravity.”
Well, there are really two different things going on here. There is a “speed of gravity”, that is equivalent to the speed of light, but this just means that any change in gravity would propagate at the speed of light. When it comes to gravity from black holes trapping light, it is able to do this because even the speed of light is lower than the escape velocity to get out of a black hole’s gravity well.