How the James Webb telescope sees ‘back in time’ | NASA JWST explained?

The James Webb telescope can look at things that happened long ago, almost like looking into a time machine.

Imagine you're standing on a really dark street, and someone turns on a flashlight far away. You see the light after a little delay, it takes time for the light to reach your eyes. The same thing happens with stars and galaxies: the light they send out has been traveling through space for hundreds of millions of years before we see it.

The James Webb telescope is like a super-sensitive flashlight detector, but instead of detecting light from nearby things, it detects light that came all the way from the beginning of the universe. So when we look at those faraway galaxies, we're actually seeing what they looked like long ago, almost like watching a movie from the past.

Think of space as a big, dark ocean. Light is like a boat traveling through this ocean. The farther away the light has to travel, the more time it takes to reach us, and that means we're seeing things as they were in earlier times.

The James Webb telescope can catch even the faintest lights from the very first stars and galaxies, which are now so far away that their light took billions of years to reach us. So when we look at them, it's like looking back in time, not with a magic wand, but with a really smart telescope!