Is Time Travel Possible?

The Short Answer:

Although humans can't hop into a time machine and go back in time,

we do know that clocks on airplanes and satellites travel at a different speed than those on Earth.

We all travel in time! We travel one year in time between birthdays, for example.

And we are all traveling in time at approximately the same speed: 1 second per second.

NASA's space telescopes also give us a way to look back in time. Telescopes help us see stars and galaxies that are very far away.

It takes a long time for the light from faraway galaxies to reach us. So, when we look into the sky with a telescope,

we are seeing what those stars and galaxies looked like a very long time ago.

However, when we think of the phrase "time travel," we are usually thinking of traveling faster than 1 second per second.

That kind of time travel sounds like something you'd only see in movies or science fiction books. Could it be real? Science says yes!

How do we know that time travel is possible?

More than 100 years ago, a famous scientist named Albert Einstein came up with an idea about how time works.

How do we know that time travel is possible?

He called it relativity. This theory says that time and space are linked together.

How do we know that time travel is possible?

Einstein also said our universe has a speed limit: nothing can travel faster than the speed of light (186,000 miles per second).

Is Time Travel Possible?

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