World War II took place more than 70 years ago. If we can reach an area of 100 light-years away in an instant, then on earth we will certainly not see World War II. Earth is a planet that does not emit light, but under the sun's rays the Earth can have a spectrum that can be detected just as we now analyze the spectrum of exoplanets. A hundred light years away to reach an instant, then look at the earth, to see the earth 100 years ago, the optical signal.
100 years ago, the Earth in 1917, when the Earth was still in World War I, so you saw World War I, not World War II. If you want to see World War II, the light signal of World War II has not reached 100 light years away, so you can not see World War II. To see World War II, you have to wait for a few years time. From this passage reveals a philosophical thought that anything that exists in the universe leaves a light signal which, if received by one, can be seen, and if no one receives, your history drifts in the universe .
Of course, this is a theoretical argument. Even if we receive spectral signals from extrasolar planets, we can not interpret what happened on the extrasolar planet hundreds of years ago. Human science and technology have not yet developed so well to see the so-called images. Therefore, one hundred light years away to reach an instant, then look at the earth, but also to see the Second World War, this level of humanity has not yet. Which revealed the use of optical imaging technology, the scene will be restored on the planet appears, this estimate is only available in science fiction films. However, using ultra-sensitive radio telescopes 100 light years ago, it may be possible to detect radio waves for human use, but it is likely to have become noise.
Authors get paid when people like you upvote their post.
If you enjoyed what you read here, create your account today and start earning FREE STEEM!
If you enjoyed what you read here, create your account today and start earning FREE STEEM!