A Quote by Stephen Hawking

The increase of disorder or entropy with time is one example of what is called an arrow of time, something that distinguishes the past from the future, giving a direction to time.

Stephen Hawking

Quote Topics

Arrow Direction Disorder Distinguishes Entropy Example Future Giving Increase Past Something Time

Quote Author

Stephen Hawking
English - Physicist
January 8, 1942 - March 14, 2018

You may see a cup of tea fall off a table and break into pieces on the floor... But you will never see the cup gather itself back together and jump back on the table. The increase of disorder, or entropy, is what distinguishes the past from the future, giving a direction to time.

Stephen Hawking

What differentiates time from space is that time does have a direction. In that sense it is different from space. I think that's certainly true that whereas spatial dimensions don't have direction or an arrow, time does. It runs from past to future. But I see that arrow of time as rooted in a deeper metaphysical reality, namely the reality of temporal becoming - of things coming to be and passing away. That is why time has this arrow. But it's not sufficient to simply say that time and space are distinct because time has a direction. The question will be: why does it have a direction?

William Lane Craig

The arrow of time doesn't move forward forever. There's a phase in the history of the universe where you go from low entropy to high entropy. But then, once you reach the locally maximum entropy you can get to, there's no more arrow of time.

Sean M. Carroll

Just like a computer, we must remember things in the order in which entropy increases. This makes the second law of thermodynamics almost trivial. Disorder increases with time because we measure time in the direction in which disorder increases. You can't have a safer bet than that!

Stephen Hawking

Order is the law of nature, the universal trend, the cosmic direction. If time is an arrow, that arrow points toward order. The future is pattern, organization, union, intensification; the past, randomness, confusion, disintegration, dissipation.

Alan Lightman

The particular aspect of time that I'm interested in is the arrow of time: the fact that the past is different from the future. We remember the past but we don't remember the future. There are irreversible processes. There are things that happen, like you turn an egg into an omelet, but you can't turn an omelet into an egg.

Sean M. Carroll

Or in other words, why does disorder increase in the same direction of time as that in which the universe expands?

Stephen Hawking

More fundamentally, it is a dream that does not die with the onset of manhood: the dream is to play endlessly, past the time when you are called home for dinner, past the time of doing chores, past the time when your body betrays you past time itself.

John Thorn

Time present and time past Are both perhaps present in time future, And time future contained in time past. If all time is eternally present All time is unredeemable.

T. S. Eliot

So far as physics is concerned, time's arrow is a property of entropy alone.

Arthur Eddington

Disorder increases with time because we measure time in the direction in which disorder increases.

Stephen Hawking

The asymmetry of time, the arrow that points from past to future, plays an unmistakable role in our everyday lives: it accounts for why we cannot turn an omelet into an egg, why ice cubes never spontaneously unmelt in a glass of water, and why we remember the past but not the future. And the origin of the asymmetry we experience can be traced all the way back to the orderliness of the universe near the big bang. Every time you break an egg, you are doing observational cosmology.

Sean M. Carroll

The past is an interpretation. The future is on illusion. The world does not move through time as if it were a straight line, proceeding from the past to the future. Instead, time moves through and within us, in endless spirals. Eternity does not mean infinite time, but simply timelessness. If you want to experience eternal illumination, put the past and the future out of your mind and remain within the present moment.

Shams Tabrizi

The mystery lies in the here and now. The mystery is: What is one to do with oneself? As you get older you begin to realize the trick time is playing, and that unless you do something about it, the passage of time is nothing but the encroachment of the horrible banality of the past on the pure future. The past devours the future like a tape recorder, converting pure possibility into banality. The present is the tape head, the mouth of time. Then where is the mystery and why bother kicking through the ashes? Because there is a clue in the past.

Walker Percy

The future is foretold from the past and the future is only possible because of the past. Without past and future, the present is partial. All time is eternally present and so all time is ours. There is no sense in forgetting and every sense in dreaming. Thus the present is made rich.