Black Holes can suck up light and other black holes. The first theories on black holes were created in the 18 century by French and English scientists . Black holes give off radio waves and x rays. Our galaxy has about 100 million black holes .
It is impossible to see a black hole from Earth. The farthest black hole from us is “Perseus A” which is 235 million light years away from Earth. This black hole can get energy from sound waves. One single black hole can be 800 light years across. Black holes can supposedly time travel but that has not been proven. Black holes are cool to me because I am interested in our galaxy and the black holes in other galaxies.
In conclusion black holes are very powerful and big objects in space that could possibly cause time travel.
Learn more go to http://hubblesite.org/explore_astronomy/black_holes/home.html
And a book “ Universe”