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re: Joe Rogan & a NASA astrophysicist talk about measuring time
Posted on 5/29/26 at 1:48 pm to GRTiger
Posted on 5/29/26 at 1:48 pm to GRTiger
quote:
but universal time is happening all at once because it is perceived differently throughout the galaxy depending on how fast or slow you're moving.
Also depends on how close you are to a source of gravity since gravity bends time and space as well.
Posted on 5/29/26 at 2:02 pm to IAmNERD
quote:
IAmNERD
Name checks out
Posted on 5/29/26 at 2:18 pm to Techdave
quote:
Here's my thoughts. We can't actually measure time to begin with. Clocks are just ticking along to a frequency and not actually attached to time.
Nah. You could apply that same logic to any measurement. All measurement is the application of some arbitrary standard.
How do we measure distance, for example? If you want to know how many feet it is from point A to point B, you first define a “foot” and then you count the number of 1-foot increments between the two points in a spatial dimension. Time is no different. You define the “second” then count the number of increments between two points in the time dimension.
quote:
When an object moves through space at close to the speed of light, and it appears to lose time, but I think it's a problem with the time measuring device actually being physically slowed down. And not actual time being slowed down. The speed provides a resistance to things moving, such as the clock hands (or atoms) , and not an actual slowing of time.
It’s not that the fast-moving clock “loses time.” An observer traveling at high speed alongside the clock would see it tick at normal speed, but an observer in the rest frame would see it tick slowly. That’s the entire point of relativity - there is no universal time. The amount of time that passes in two different reference frames is relative.
Posted on 5/29/26 at 2:37 pm to CleverUserName
quote:
A clock measures the earth's rotation. As we stand here on it. Is that clock any good as you leave earth? Nope. It's a useless trinket then.
The original units may have been defined based on the rotation of the Earth, but the standard is no longer tied to that rotation. Nowadays the second is defined based on fundamental properties of matter - specifically the resonant frequency of Cesium-133. Which means that the origin of the unit might be meaningless on another planet, but the unit itself is just as applicable wherever you go.
But to your point, it’s really no different than any other measurement. The kilogram was originally defined based on the mass of 1 liter of water, but it’s just as meaningful when you’re measuring a container full of nitrogen.
Posted on 5/29/26 at 2:55 pm to lostinbr
quote:
It’s not that the fast-moving clock “loses time.” An observer traveling at high speed alongside the clock would see it tick at normal speed, but an observer in the rest frame would see it tick slowly. That’s the entire point of relativity - there is no universal time. The amount of time that passes in two different reference frames is relative.
I think there is universal time. But we can’t accurately measure it to begin with. Pretty difficult to measure something you can’t see, hear, or touch.
I think everyone stays on the same time, but I also definitely think the theory of relativity still applies. Meaning yes, the person moving with the clock thinks time is normal, and the stationary observer it appears to have slowed down. But I think the just the clock slowed down, not actual time slowing down. All due to the whole "mass increases near speed of light" stuff.
Not saying I’m smarter than Einstein, just saying it’s ok to question things. That’s how new theories are formed.
This post was edited on 5/29/26 at 4:21 pm
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