Are time travel and wormholes possible?
Measured time dilation, hypothetical wormholes and travel into the past have different status. What clocks demonstrate and what a quantum processor did not create.
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#relativity
Articles: 8
What happens if you approach a black hole?
Tidal stretching, hot gas and the event horizon have different effects. What can a spacecraft survive, and why does a distant observer see the fall differently?
What is a black hole?
Event horizon, singularity and shadow are different concepts. Understand the boundary on escaping light, the EHT image and why black holes do not suck in everything.
What did Albert Einstein actually discover?
Special and general relativity, mass and energy, quanta and Brownian motion: what Einstein changed and why Newton’s laws remain useful.
Why does gravity affect time too?
Two stationary clocks at different heights accumulate different durations. How gravitational potential, exchanged signals and atomic-clock experiments explain the effect.
Why does time slow down during fast motion?
A light clock explains which intervals relativity compares, why a moving clock runs slow and how the travelling-twin puzzle is resolved.
Why is the speed of light so special?
Vacuum c limits causal influence. Explore a light cone, a velocity-addition example and the distinction between signals and moving wave patterns.
What is space, and can it be curved?
How angle measurements reveal curvature: a spherical triangle, rolled paper and the limits of the analogy with curved spacetime.