Science & Mathematics » Astronomy & Space » Is the time we experience today the same as time that occurred billions of years ago?

# Is the time we experience today the same as time that occurred billions of years ago?

• yes. The now you are in right now is the same now as the now then
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• Time is affected by velocity, and by way of the equivalence principal also gravity. The expansion of space will have no effect on the rate that time flows. Time dilation is only a result of the speed of light limit for velocity.
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• Actually no, you see before that thing crashed into Earth and created the moon days were less then 10 hours, but because of the moon the pull of the tides slowed the rotation to 26 hours, and we've been speeding back up ever since, we're at 24 right now but in millions of years we're be at 23 and so on.
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• The rate of flow of time(locally) changes from place to place and time to time in the grand scheme of universe.

Billions of years ago, may be the material that we are composed off, was not even existing.Or might be if it existed close to some black hole, then the the time would have been flowing slowly with reference to today.
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• I have wondered about the same for a long time and I haven't found a definitive answer. Take for example, the expansion of the universe. We observe the red-shift of distant galaxies. But is time constant everywhere? Because if it wasn't, the red-shift could indicate a temporal difference. As we observe a distant galaxies, which we see as it was billions of years ago, if time then took more "time" then we would also observe the frequency shifting in the spectrum of the light, right?

The thing is: for any observer, time is constant. Say, I fly my super-duper spaceship at nearly the speed of light, relative to you. I switch on my headlights that illuminate nearly instantly any object in front of me. But from your point of observation, you see the light moving slowly ahead of me because you can't see anything moving faster than the speed of light. So, what happens? Well, what is perhaps a minute for me in my spaceship, is a year, for you on earth. That is time dilation!

So, is it space that is expanding ... or time? I don't know and if I did, I wouldn't answer your question but rather, pack up my suitcase for Stockholm, to receive the Nobel Prize in Physics! ;-)
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• this is a strange question but i think i can appreciate the imagination it must have taken to formulate such an inquiry.

short answer: yeah, its the same.

The perception of time passing 1,000,000 years ago here on planet earth would be exactly the same as the perception of time you are experiencing currently. I say this because, though Einstein proved that time is a relative measurement, there was no other force that has acted on the space-time around Earth. Time may be perceived differently by two people in two different places due to a manipulation of the space that the person is in. An object with a large enough mass (say a black hole) could cause the space it is moving through to be warped to such an extent that it, to a person experiencing time close to the mass, will slow time relative to an observer that is nowhere near the large mass who would experience time being passed much more rapidly
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• Well, yes and no. It's complicated. Just after the Big Bang, the Universe was much denser than it currently is, which means that there was a much stronger gravitational field permeating space. Gravitational fields cause time to run slower *locally*...but there's the problem. When the entire universe is experiencing stronger gravity, there's no such thing as *local*. Clocks in the early universe would have run more slowly than they run today, but if you'd been present immediately after the Big Bang, you'd have no standard by which to compare. In other words, you'd never notice that time was running slowly.

Today the Universe is much more spread out, and there are locally stronger pockets of gravity (stars, planets, black holes, etc), so you CAN make detailed measurements of the slowing of time in the presence of a gravitational field.

I hope that helps. Good luck!
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