Astronomers found a similar galaxy with milky from billions of light years away.

"An artist impression of our Milky Way galaxy in its youth. The Sparkler galaxy shows similar activity to an infant Milky Way. (James Josephides/Swinburne University/CC BY 4.0)" (ScitechDaily.com/Astronomers Find 'Mirror Image' of The Milky Way From Billions of Years Ago)

Astronomers can see the past by looking at objects that are billions of lightyears away from the Earth. So when we see galaxies from another side of the universe we see what happens to them billions of years ago. Same way as we see what happens in Alpha Centauri four years ago because the distance to Alpha Centauri is about 4 ly. We see what happened in a distant galaxy 12 billion years ago if the distance to that object is 12 billion light years. 

That caused an idea about the possibility that maybe. Someday we can see ourselves in the past. The thing requires the reflecting cloud at a certain distance. So theoretically, if we want to see what happened 100 years ago we must find the reflecting cloud that is 50 ly from Earth. 

The reason for that is that light must travel in both directions. Black holes or icy clouds can make the light reflect and that means someday in the future we can see our galaxy in the past. Black holes can make radiation make the U-turn. That means the same information that was left from some planet could return to the point where it was left. 

The real problem is that the reflection must be so accurate that we can detect our planet from that reflection. And maybe there is no possibility to use that thing to see the past and see what happened on Earth. But large size reflecting clouds or black holes can turn radiation back where it came from. And there is the possibility that someday we can see the reflection from our solar system or home galaxy in its youth. 

https://www.sciencealert.com/astronomers-find-mirror-image-of-the-milky-way-from-billions-of-years-ago

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