Albert Einstein proposed that matter curves space-time, and that gravity is the curve that causes objects to deviate from traveling a straight line. The distortion causes the objects that were moving along a flat plane to fall into a spherical path.
There are a number of documentaries out there that detail the different aspects of the science world, including quantum physics, explanation of quantum theories and the time space continuum. What are the best documentaries about quantum physics?
Super Massive Black Holes by PHD Comics. Sagittarius A*, the super massive black hole at the center of the Milky Way, has a mass million times the mass of our sun, and a diameter equal to the distance between the sun and Mercury.