Science Matters
Cosmological Arrow of Time
The arrow of time is a concept that was developed in 1927 by British astronomer Arthur Eddington. It states that the flow of time is asymmetric. There appears to be an obvious direction to time. It appears to flow in one direction
Space-Time Expansion
The Cosmological Arrow is the direction of time in which the universe expands (represented by this space-time diagram).
Psychological Arrow of Time
The Psychological Arrow of Time is our perception of how time passes. It is the direction of time in which we remember the past, but not the future.
The Psychological Arrow of Time is how we "feel" or perceive the passage of time to be. To us Time appears to flow, much like a river.
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