41.   American astrophysicist Martin Schwartzchild gave his name to the radius at which the gravitational forces of a collapsing star increase to the point that not even light can escape.

42.   He recorded speeds, angles, the gravitational forces that were at play during a particularly adrenaline-pumping moment.

43.   The camera brought them right inside the rocket as the gravitational forces pressed the crew members back into their cramped seats.

44.   The gravitational force from a black hole is so powerful that nothing can escape, not even light.