What will happen is, is as the twin is flying to the the
other planet, and then flying back, very close to the speed of light.
Time for that twin will move more slowly, meaning, literally, the
number of heartbeats that they have experienced, the ticking of their clocks.
that, their time will flow more slowly relative
to the twin on Earth.
So when the twin lands, it will be
perhaps three years that they will have experienced on
the spaceship, whereas the twin who stayed home
Will now be, will be 30 years for them.
So the, the, the twin will get out of the space ship
to greet their, their sibling and suddenly they see an old person.
It'll be very shocking for them if they didn't know about time dilation.
And this is the most dramatic example of how space and time
have to distort The, for the twin
on the spaceship, they didn't notice any difference.
Time flowed for them just the way it always does.
But it's only when they meet up with someone who wasn't traveling.
Who was not in their frame of reference that this
effect of time moving at a different speed becomes apparent.
So really, what we learned from special relativity is
that space and time alone are no longer absolute.
That each can grow or shrink depending
on how, people are moving relative to each other.
And we know have to think about this new quantity called space time.
Which is the most, which is really what is absolute.
Which is really the ground of physical reality.
So, with that, now we're able to take the next step
forward in our understanding and begin to talk about General relativity.
And general relativity is where Einstein went beyond just
inertial frames and began to consider accelerations as well.
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