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/sci/ - Science & Math

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[ERROR] No.3723525 [Reply] [Original]

"The world is 13.7 billion years old" RELATIVE TO WHAT? I'm asking because I just heard time is relative..

>> No.3723532
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Pic related

>> No.3723538

Relative to its current age.

>> No.3723539

Good question

>> No.3723544

yeah man, like
everything is relative and shit
fucking einstein is genius

>> No.3723549

Do you know what a light-year is? It's how far a single photon travels in an EARTH YEAR.

Time is relative to Earth.

>> No.3723554

Relative to Earth time I suppose. As far as I can think of, there are no places of absolute time (space-time isn't warped from gravity), however I could be wrong.

>> No.3723555

The approximate rest frame of the Earth.

>> No.3723563 [DELETED] 

>>3723538
>Relative to its current age.

Tautalogic

>> No.3723565

relative to human brain.

>> No.3723604

>>3723549
What? Light years are measurements of distance, not time. Lol oh /sci/

>> No.3723608
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>>3723525

>RELATIVE TO WHAT?

Relative to the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

>> No.3723609

Relative to the present.

>> No.3723622

>>3723604

/sigh

What is a light-year? What is a year?

Where did that year come from?

One Earth year.

Ergo, time is relative to us, Earth.

>> No.3723630
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>>3723608

>> No.3723637

>>3723604
set c=1
learn

>> No.3723669

>>3723608
/thread

>> No.3723673

>>3723608
Thread_Slayer_1999

>> No.3723694

First of all, it's the universe that's 13 billion years old.
When people say that time is relative, they mean that the flow of time changes depending on various factors.
We are saying the universe is 13.7 billion years old, we mean that it's 13.7 billion years old from one frame of reference. in this case, that reference frame is that of Earth.

>> No.3723700
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>>3723608

>> No.3723750

How exactly do they estimate the age of the universe? I read that it is based on the age of the oldest known star. But what about light that hasn't reached us yet? What about light that will never reach us in our lifetime because it's so far away? Surely, the universe might be a lot more older than 13,7 billion years.

>> No.3723758

>>3723750
Redshift

>> No.3723781

>>3723758

Does that mean they can tell how fast objects are moving away from a certain point by analyzing their spectrums?

I'm so confused.

>> No.3723795

>>3723781
Fucking google it.

>> No.3723845

This was why Einstein didn't like the big bang theory, a singularity implies a universal begging which he believed contradicted relativity. Hawking's major career achievement along with Penrose was proving that a singularity was indeed a solution to the Einstein equation. In order to truly understand the answer to your question you would need to know a lot of physics that anyone short of a Ph. D. in physics would not know.