Okay, so according to our brother's mathematicians, a tensor is an algebraic object that describes a multilinear relationship between sets of algebraic objects related to a vector space. Does it make sense?
Many people believe that special relativity is the major hurdle when it comes to interstellar travel, as the speed of light is the upper bound of how fast can you move.
There is one problem regarding black holes that I never truly understood.
Imagine you have a submarine in the ocean able to reach very high velocities.
Probably all of you know that light is an electromagnetic wave.
I have been asking physicists the same question for more than a year now, and all of them answered straight away without any hesitation.
Imagine someone placed one kilogram ball of metal on Earth, but just for fun, he takes all the electrons away.
Welcome aboard Captain.