I don’t really understand it, could someone explain in basic terms?
Are we saying if a star is 120 million lightyears away, light from the star would take 120 million years to reach us? Meaning from the pov of time on earth, the light left the star when the earth was still in its Cretaceous period?
In: 292
If a star is lets say 65 million light years away, when you look at that star that night, bear in mind that what you see happened when the dinosaurs went extinct.
Basically all you see above is the past
If you could teleport to another planet, which is 3 light years away, and if you had a telescope which could see the Earth from there, you would see yourself gazing up in your garden, as the light is still the past, from three years ago.
Look up the deep space picture from Hubble, with the furthest galaxies, which are not yet properly formed yet. We are seeing in this picture the past, how it looked like 6-10 billion years ago. We dont really know if that galaxy is actually there, it was there 10 billion years ago, but where could it be now ? We dont know
Here on Earth, if you see your neighbour driving on the street, it is still the past, the difference between that and the present is negligible… It is less than 0.000000000000001 seconds, thus you percieve that as present, if we go further how do you define the present.
It never really exists if you think about it…
So it is really fascinating and mind blowing
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