query: Why are we not able to move at the speed of light again?
positive_passages.docid: 18799
positive_passages.text: If I run along the aisle of a bus traveling at (almost) the speed of light, can I travel faster than the speed of light?
negative_passages.docid: 39399
negative_passages.text: Will free-fall object into black hole exceed speed of light $c$ before hitting black hole surface?
negative_passages.docid: 39242
negative_passages.text: Why can't we see light travelling from point A to B?
negative_passages.docid: 141546
negative_passages.text: Time and distance in a photon's frame of reference
negative_passages.docid: 57608
negative_passages.text: Approaching speed of light: why do objects appear further away in front of me?
negative_passages.docid: 72901
negative_passages.text: Can Special Relativity hold even without motion?
negative_passages.docid: 16748
negative_passages.text: What happens if light/particles exceeded the speed of light for a particular medium?
negative_passages.docid: 2754
negative_passages.text: Why and how is the speed of light in vacuum constant, i.e., independent of reference frame?
negative_passages.docid: 27365
negative_passages.text: Why can't light escape from a classical black hole?
negative_passages.docid: 137260
negative_passages.text: How is quantum mechanics compatible with the speed of light limit?
negative_passages.docid: 127383
negative_passages.text: Speed of light in general relativity
negative_passages.docid: 56930
negative_passages.text: What would an observer see if he/she flew toward a clock at relativistic speeds?
negative_passages.docid: 14036
negative_passages.text: What is so special about speed of light in vacuum?
negative_passages.docid: 8865
negative_passages.text: Could gravity accelerate light?
negative_passages.docid: 80291
negative_passages.text: Relativistic velocity addition from time dilation
negative_passages.docid: 10781
negative_passages.text: Accelerating particles to speeds infinitesimally close to the speed of light?
negative_passages.docid: 25121
negative_passages.text: Is it really possible to break the speed of light by flicking your wrist with a laser pointer?