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Abstract
excerpts.
Trading Cards
Jul 1632
Relativity Principle
Relativity Principle
The laws of physics work the same for all observers moving at a constant speed. There is no absolute state of rest.
Relativity
Story
Can anything travel faster than light?
Universal Speed Limit
Nothing can travel through spacetime faster than light, but our expanding universe is carrying nearly all galaxies away faster than light.
Relativity
FAQ
Does my gravity pull on the Sun?
Mass
Gravity is universal: every mass influences every other mass, no matter how small.
Relativity
FAQ