Newton - Gravity

Mass produces force.
Mass is unvarying.
Gravitational force falls off with distance.
Gravity acts instantaneously.

Einstein

Mercury - moves faster than predicted by Newton (perihelion moves ahead).
Mass is equivalent to energy.
Mass-energy curves space-time.
Mass changes with speed.
Gravity propagates at speed of light.

Einstein's Predictions

1. Procession of perihelion.
Perihelion = closest approach to Sun = twists.
For Mercury 43 seconds of arc per century.
2. Light bending and extra radar time delay.
3. Gravitational Radiation binary pulsar slows down recent Noble Prize.