Black Holes truly are the final frontiers of space. Their gravity is so strong, not even light can escape. If you get sucked in, you would be compressed to almost nothing – worse than Gumby meeting the steamroller. If the earth were sucked into a black hole the entire planet would be compressed to a point so small you would need a microscope to see it.
Rumor has it if you get sucked in, you come out in another dimension, or in another part of the universe. Or you get to meet Elvis. The current theory is that there is a super black hole in the center of our Milky Way.