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WHY DOES TIME GO SLOWER IN SPACE??

Blog#329

Wednesday, September 6th, 2023

Welcome back,

Time dilation goes back to Einstein’s theory of special relativity, which teaches us that motion through space actually creates alterations in the flow of time. The faster you move through the three dimensions that define physical space, the more slowly you’re moving through the fourth dimension, time––at least relative to another object. Time is measured differently for the twin who moved through space and the twin who stayed on Earth.

The clock in motion will tick more slowly than the clocks we’re watching on Earth. If you’re able to travel near the speed of light, the effects are much more pronounced.

Unlike the Twin Paradox, time dilation isn’t a thought experiment or a hypothetical concept––it’s real. The 1971 Hafele-Keating experiments proved as much, when two atomic clocks were flown on planes traveling in opposite directions.

The relative motion actually had a measurable impact and created a time difference between the two clocks. This has also been confirmed in other physics experiments (e.g., fast-moving muon particles take longer to decay).

So in your question, an astronaut returning from a space journey at “relativistic speeds” (where the effects of relativity start to manifest—generally at least one-tenth the speed of light) would, upon return, be younger than same-age friends and family who stayed on Earth.

Exactly how much younger depends on exactly how fast the spacecraft had been moving and accelerating, so it’s not something we can readily answer. But if you’re trying to reach an exoplanet 10 to 50 light-years away and still make it home before you yourself die of old age, you’d have to be moving at close to light speed.

There’s another wrinkle here worth mentioning: time dilation as a result of gravitational effects. You might have seen Christopher Nolan’s movie Interstellar, where the close proximity of a black hole causes time on another planet to slow down tremendously (one hour on that planet is seven Earth years).

This form of time dilation is also real, and it’s because in Einstein’s theory of general relativity, gravity can bend spacetime, and therefore time itself. The closer the clock is to the source of gravitation, the slower time passes; the farther away the clock is from gravity, the faster time will pass.

Originally published on technologyreview-com

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"WHAT IS THE DIFFERENCE BETWEEN A STAR, A PLANET, AND A MOON??"

The background of this photo I know that you all know it, but as a person who is graduated for teaching in science let me add more.

The nightmare of a teacher is when a student proves that he/she is right. And Thomas not only prove to his teacher that he was right when he told that his uncle was Superman, but he prove it in schools rank. Of course as a great uncle and person that he is, Henry didn't mind to support his nephew.

And for curiosity, I don't work as teacher because student as Thomas are rare.

Marilyn Monroe vs other woman

A cartoon for New Scientist.