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9 months ago in Cosmology By Shashank

What even is time, really?

We all feel time passing, but physicists seem weirdly cagey about what it actually is. Is time a fundamental thing, or is it just a kind of illusion?

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By Sourabh Answered 2 months ago

Great question, and the honest answer is: we don't fully agree. In relativity, time is a dimension woven into spacetime as real as space, just different. But some theories suggest time isn't fundamental at all; it emerges from a deeper, timeless reality. The "arrow of time" why we remember the past but not the future seems tied to entropy increase. So time might be less a cosmic clock and more a symptom of the universe winding down.

 

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