What Everyone Gets Wrong About Gravity

Whether a charged particle radiates in a gravitational field tests gravity's nature because if gravity were a Newtonian force a free-falling (accelerating) charge would emit radiation, but in general relativity a free-falling charge is inertial and shouldn't radiate while a stationary, ground-accelerated charge should.

Light is deflected near mass because an accelerating frame makes a straight light beam strike a lower point during transit, and by equivalence mass—locally like acceleration—curves spacetime so passing light is measurably deflected.

All objects fall the same way because free-falling bodies simply follow the same spacetime geodesics set by curvature, so their trajectories are independent of mass or internal composition.

In curved spacetime you must accelerate to remain at fixed spatial coordinates because curvature terms in the geodesic equation act like extra acceleration as time evolves, so resisting those curvature-driven changes requires a sustained upward acceleration.

Standing on Earth's surface is actually being accelerated upward because the ground's normal force prevents you from following a free-fall geodesic, so you are being pushed off the inertial path rather than pulled down by a force.

An accelerating rocket produces the same internal effects as standing on a planet because the rocket's floor accelerates into you, creating a normal force on your feet identical to the support force on a planet.

The common bent-sheet demo misleads because it uses an external downward force to make balls fall into the well, which encourages a force-based intuition instead of seeing objects as traveling on straight geodesics in curved spacetime.

Astronauts in orbit are weightless because they follow spacetime geodesics, and their straight motion through curved spacetime appears as a helical orbit when projected into space and time around Earth.