Ask a question about the light-year universe

In fact, just looking up at the starry sky is also a kind of time travel.

We can really see a lot of things in the early universe.

Light-year refers to the distance that light travels in a year.

If there is a big mirror a few light years away from us, you may be able to see the earth a few years ago.

Theoretically, as long as you are fast enough, we can see ourselves in the past.

If you are 1E light years away, you should be able to see the solar system 1E years ago through the Hubble telescope.

According to this theory, what we see is the past, and the farther the distance, the longer the interval.

When aliens saw us, our earth had disappeared.

It exists in a mere visit, or a wormhole.

If the limit speed of information transmission is the speed of light, then time synchronization in the distance is meaningless.

It has long been suggested that if you observe the earth hundreds of millions of light-years away from it, you can see what the earth looked like hundreds of millions of years ago, that is, if conditions permit, you can see everything that happened on the earth in the past.

At the same time, because the quality of the galaxy itself distorts the space, in fact, the scenery we see is distorted and unreal.