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We are "the edge of the expanding universe" from the perspective of the galaxies you are mentioning. Any given location in our universe looks like it's the center, so the edges of our own observable universe would not be experiencing anything different than ourselves.

It was very over exaggerated in the movie. The effect is real. There's time dilation due to both special relativity (the speed of satellite) and general relativity (how deep in the gravity well the satellite is).

The time dilation in the movie is so extreme, that I'm not sure a planet could even exist so close to the event horizon. There is such thing as innermost stable orbit around black hole; I wouldn't be surprised if for such extreme time dilation, a planet would need to orbit closer than innermost stable orbit (which would be impossible).

The clocks are slowed down by orbital speed, and also slowed down by how "deep" in gravity well they are. This means anything in orbit will experience its clock slowed down depending how fast it moves. Further away, the slower it moves, the less the clock in the satellite is slowed down compared to the surface of the body it orbits. However, the further away the satellite is, higher in the gravity well it is, and faster its clock ticks compared to the clock on the surface of the body it orbits. In case of Earth, there is an orbit where these two effects cancel each other. See this graph https://en.wikipedia.org/wiki/Gravitational_time_dilation#/media/File:Orbit_times.svg

> i see no reason to not believe that there are planets experiencing many years in the matter of a short time for us

Well, one good reason is "time dilation doesn't work like that". You can't have negative velocity or negative mass, so nowhere in the universe is significantly faster than on Earth.

In CS a "heartbeat" is a periodical signal that is sent to confirm that a process is still running.

Just move away from any gravitational body, and the clock will speed up. There are some nice documenteries on atomic clocks put in aicraft and flown around for a few hours and then compared to their ground based brethren.

An even more up to date drift comparison is the ground based clocks used to keep the GPS satellite constellation atomic clocks aligned.

I have the same question from a diferent perspective. The more matter you have around you/the deeper you are in a gravity well (same thing), the slower time runs. This question asks about time on planets; I want to ask about time in the center of megagalactic voids. Time runs faster there than it does inside a cosmic thread of galaxies. So when I see a claim that the universe is 13.8 billion years old, I wonder how old it is depending on where you are. Has anyone seen a contour map of what time it is in the universe?

It was the size of a corgi and weighed as much as 4 baby elephants, if that clarifies things.

Technically you’re right

Time does move slightly slower at your feet than your head for example

And slower in denser regions of space than less dense ones

I think you may be misunderstanding the movie...(or I'm misunderstanding you...) There was no lightspeed travel. It was a wormhole. The time dilation was solely due to the proximity to the blackhole.

I was just going to recommend this book. Finished it a few months ago on audible and it creeps into my thoughts regularly.

Those galaxies moving away from us are not moving through space. They are carried away by expanding space. That's a very important difference. A lot of this stuff applies only to things moving through space.

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Any one dead?

He means this Dragon's Egg:

https://en.wikipedia.org/wiki/Dragon%27s_Egg

The science in this book is as factual as hard science fiction can get. Zero handwaving or fantasy physics.

Bob Forward was not just an author, he was a career physicist.

>Robert Lull Forward (August 15, 1932 – September 21, 2002) was an American physicist and science fiction writer. His literary work was noted for its scientific credibility and use of ideas developed from his career as an aerospace engineer. He also made important contributions to gravitational wave detection research.

There aren't many people who can do both those things well.

I've wondered this too are planets closer to the center of the galaxy, i.e. higher gravity, experiencing time slower than we are

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A planet could orbit a black hole like in interstellar, but I don't think time would be dilated on the planet. Time really wouldn't be dilated until you get very close to the black hole. I'm talking in generalities, I'm not really sure how far that distance would be. A planet orbiting a black hole wouldn't receive any heat or sunlight from the black hole, so I would imagine it would just be a cold world, not really hospitable to life.

OP, I think you'll appreciate this video by Dr Kipping (Cool Worlds channel on YouTube) that discusses time dilation via space travel.

Lots of very cool stuff in there to ponder! And his whole channel is a big rabbit hole. A gravity well so deep, you might even call it a black hole. 😏

https://youtu.be/b_TkFhj9mgk

tl,dr: i agree with you and my similar theory is the same as yours, just a few orders of magnitude out from the center but still applies to what your saying

ive had a very similar thought and took it to the extent that time outside of the reach of the black hole in the center of a galaxy may be almost immeasurably different than anything caught in its field past the very edge of the field. the true time constant. essentially viewing a galaxy from the point of view where you arent affected by dilation at all; to me, would seem that every galaxy would pop in to and out of existence almost immediately. all observable light from other galaxies would essentially be filtered through our own galaxy's black hole dilation gradient; so, its entirely possible that both perspectives are happening simultaneously; which would infer that, if we ever left our galaxy to get to another galaxy, it would have already evaporated because we left the dilation field.

your line of reasoning seems sound to me. the only thing that might vary between your hypothesis and reality would be the varying degrees of dilation vs the distance to the black hole

the whole thread ended really badly for me, so good luck

Not noticeably faster, but yes it’s possible that other planets may experience time a bit slower than us. Time slows down with lots of mass nearby (this is what causes gravity). So if another planet was orbiting near a neutron star, it’s time would go slightly slower relative to our point of view.
There is also relativity, where if the planet is moving away/towards us very fast, its time will be relatively slower. For the real mind trip, we’d also be going slower from their point of view! There will be planets out there whose time goes eg 0.000000000000001% faster than us, because they have less nearby mass.

You're welcome. I hope you enjoy it. I did.

This could be the case.. however any civilization that does this puts themselves at risk of being inferior to the civilization that 'had more time' to develop superior technology while they were in proximity to the gravity well

Thanks for recommending this. I just listened to the preview and bought it.

Thank you for your thoughtful reply.