How James Webb Telescope will be able to take pictures of something millions of distance away?


How James Webb Telescope will be able to take pictures of something millions of distance away?

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Millions of distance? Technically any camera can take a picture of anything of some arbitrary distance away.

I’ll assume you mean light years.

Well, you’re still wrong because it’s aiming at taking pictures of the first galaxies which will be almost 14 billion light years away.

It can do this because light doesn’t have a range. As long as the light gets here and you have a powerful enough detector then you’ll be able to take a picture of it.

Distance does not influence the ability to see, as long as light can reach the camera (or your eyes).

For instance, when looking at the moon, you’re looking at the moon like it was about one second ago, as light from the moon takes about one second to reach your eyes.

When looking at the sun, you’re looking at the sun like it was about eight minutes ago, as light from the sun takes about eight minutes to reach your eyes.

Same principle when looking at stars, galaxies and other far-away objects; time is longer (years, thousands of years, millions of years, billions of years) but nothing prevents your eyes (or a camera) from seeing them if they’re bright enough. But you see them *as they were* when light departed those objects: when looking at something a billion years away, you see it *as it was* a billion years ago.

You can see the Andromeda Galaxy with your naked eye if you get outside of the city. Distance isn’t the problem exactly. It’s brightness. A distant object is more faint, and an object billions of light years away is going to be ridiculously faint, but telescopes get around this by having massive mirrors. The mirror on Hubble is 10 feet wide. On JWST it’s more like 23. This allows it to capture as much of that faint light as possible allowing it to render a proper image.