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Ask HN: Telescope as a Window to Our Past

2 点作者 ram1981大约 5 年前
This is for the physics nerds out there. If Hubble telescope can see a past event of a distant planet, can the earth’s past be seen by a Hubble telescope placed in a distant planet? The answer is most likely yes. So my follow up. What if there is a mirror like object on that planet that reflected the light back onto earth? Can Hubble then become a window to our past? And can we essentially manoeuvre Hubble to pick up past events “live”? It’s almost like having a drone above us but feeding us images from the past. Sorry about the long question :(

2 条评论

lgl大约 5 年前
This question or variations of it are not too uncommon and you can find some answers for this on stackexchange, reddit, quora, etc with a bit of googling [0].<p>tl;dr: Theoretically yes, practically no.<p>0 - <a href="https:&#x2F;&#x2F;www.google.com&#x2F;search?q=mirror+in+space+to+see+the+past" rel="nofollow">https:&#x2F;&#x2F;www.google.com&#x2F;search?q=mirror+in+space+to+see+the+p...</a>
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rman666大约 5 年前
It would be easier to build a time machine. Search Google for plans.