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Archive for November, 2010

How to look backwards in time


So, you want to look backwards in time?
I was discussing the idea with a few friends over the weekend!
It’s theoretically possible.
Every time we look at stars in the sky, we are viewing them in the past relative to the distance they are away from earth (usually measured in light-years).
So, what if we found a body with a reflective surface that was 2000 light years away, and we managed to focus a telescope on it to look back at ourselves like a mirror?
Well, we would see the earth as it was 2000 years ago, as the light that is being reflected would have taken 2000 years to reach us.
A very strange and mind numbing concept, but very amazing to think about 😀

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