We continue our survey with Einstein's special and general relativity. Principle ideas are bulletted; supporting evidence is emphasized subsequently.
Formal and experimental equivalence of physics on platforms moving at constant velocity with respect to one another.
Constancy of the speed of light.
Diurnal and equinoxial invariance of a multi-path interference pattern (Michelson-Morley).
Equivalence of mass and energy.
Particle-anti-particle production through scattering of high-energy photons.
Equivalence of physics on accelerating platforms and platforms at rest in a gravitational field.
Time dilation of satellite clocks.
The geodesic - gravity arises through the distortion of spacetime by mass. All particles move on their geodesic: the path, determined by their initial position and velocity, that has the shortest "length".
The perihelion of Mercury.
Influence of the sun on stellar parallax, gravitational lensing.
Black holes - a sufficiently massive object will cause enough curvature in space-time that not even light will be able to escape from its surface.
Active galactic nuclei.