: : : : : If black hole can be a tool for space traveling, why can't we to find some way to use it. : : You would have to find one first. The nearest black hole large enough that tidal effects are minimal is thought to be at the center of our galaxy - a distance of about 25,000 light years. : : So it will be quite some time before we start using that particular black hole! :) : :Can we make a black hole on the Earth? maybe we can't do it now, but we can do it in the future.