Karl Schwarzschild

Karl Schwarzschild (9 October 1873 – 11 May 1916) was a German physicist and astronomer.
Best known for his solution to Einstein's equations of general relativity, which describes the gravitational field outside a non-rotating black hole with no magnetic field.
The equation describes how a particle moves space near this black hole (using spherical coordinates). 
formula_1
ds is the path it follows 
dt is the change in time 
dr is the change in radius 
dformula_2 and dformula_3 are the change in angle 
formula_2 is also the angle 
formula_5 is the set radius limit of the heavy object 
r is how close the travelling object is to the heavy object 
c is the speed of light
This equation is also known as the Schwarzschild metric or Schwarzschild solution.