{"knowledge_schema": {"broad_category": "Physics \u2192 Relativity \u2192 Time Dilation", "refinement": "This problem involves the effects of special relativity, specifically time dilation experienced by an object moving at a significant fraction of the speed of light.", "specific_scope": "The scenario focuses on calculating the time experienced by an astronaut traveling to Earth at a speed of 0.99999987 times the speed of light, considering their perspective and the relativistic effects on time.", "goal": "Determine the time it takes for the astronaut to reach Earth from their own perspective, using the principles of time dilation."}, "summary": "This problem is rooted in the physics of relativity, particularly the concept of time dilation, which describes how time is experienced differently for observers in different frames of reference, especially at high speeds. The scenario presents an astronaut traveling to Earth at a speed very close to the speed of light, and the task is to calculate how much time will pass for the astronaut during the journey. The goal is to find the astronaut's subjective experience of time, which is determined to be 81 years."}