Space is a fundamental concept in physics, representing a three-dimensional continuum with positions and directions. In modern physics, space is often combined with time to form four-dimensional spacetime. Philosophically, the nature of space is debated, with views ranging from it being an entity in itself to a relationship between entities, or a part of a conceptual framework. Understanding space is considered crucial for comprehending the physical universe.
In 1905, Albert Einstein published his special theory of relativity, introducing the concept of spacetime and the constant speed of light for all observers.
In September 2015, LIGO scientists reported the first direct observation of gravitational waves, a prediction of general relativity.
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