x: 0.000 t: 0.000
c = 299,792,458 m/s
g: 0.000
relativity
.quest

Spacetime

Space and time are not separate. They form a single four-dimensional fabric. An event is not a place or a moment -- it is both, inseparable, a point in spacetime.

Curvature

Mass tells spacetime how to curve. Curvature tells matter how to move. Gravity is not a force -- it is geometry. Objects in freefall follow the straightest possible path through curved space.

Equivalence

Standing on Earth and accelerating in a rocket at 9.8 m/s are indistinguishable. There is no experiment you can perform to tell them apart. Gravity and acceleration are the same phenomenon.

Geodesics

A straight line through curved spacetime is called a geodesic. Light follows geodesics. Planets follow geodesics. You, sitting still, follow a geodesic through time.

time slows near massive objects clocks tick slower in stronger gravity GPS satellites correct for this daily

Beyond the horizon, physics ends.

All geodesics converge. All worldlines terminate. Information enters but never leaves. The singularity is not a place in space -- it is a moment in time. Your future, once you cross the horizon.