Hi all, I didn’t know how to formulate the question in a non stupid way so I’ll explain.
If the light we see from stars in the sky are actually “the past” as they’ve left their source light years ago, from another point in the universe another planet sees our Sun’s light the same way, correct?
If that’s the case, if there was an “universal year” or an “Universe’s current year”, would all the stars and planets be living in the same year?
Maybe I am 5, I feel 5 right now.
Thanks 🙂
In: 466
Hi!
[SpaceTime](https://en.wikipedia.org/wiki/Spacetime) refers to any **mathematical model used to describe** the combination of time and 3D space into one “continuum”
It is about math, and not really ELI5.
With that said:
* we all experience a time we call the present.
* If I am far enough away from something, **it takes a measurable amount of time for the light from that thing to reach me**. For the moon, it is 1.3 seconds for the light to reach me. Almost instant. For the sun it is around 8.3 minutes. For Alpha Centauri it is just over 4 years.
* The present is experienced by me, and all these places, but I can only see light from them at some later time.
Think of it like experiencing things at the same time as others, but then sending them a postal letter that takes time to inform them of what you did.
We are in the same time.
It takes time for notification to reach us.
Latest Answers