Say if I fly to a planet lightyears away, and I watch the Earth years before, could I see myself flying to the planet I'm currently on?
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answers:
Morningfox say: No, the light from your birth would have passed the other planet many years before you got there.
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poldi say: So lets say you were born in the year 2000.
The light of your birth started travelling out from Earth at the speed of light.
Now 20 years later you chose to fly to a planet 20 light years away.
The moment you leave the Earth, the light that left Earth when you were born is just reaching that planet.
So even if you could travel at the speed of light, you are 20 years behind the light of your birth.
If you could instantaneously transit to that planet, then yes you could see the light of your birth just reaching the planet.
But there is no such thing as instant transportation.
IF you could travel at the speed of light, you would get there in 20 years
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nineteenthly say: You couldn't do that because, assuming there would be enough light to see yourself, which there wouldn't be, that light would've overtaken you on the way there.
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someg say: Light is the third fastest thing we know about. It would be hard to go faster than it. But if you did, you would need very good brakes on your space ship, or you would smash into the planet.
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Mutt say: Based on the laws of physics as we know them, you cannot accelerate past the speed of light. So if you are (for example) 30 years old, and you traveled to a planet 30 light years away at the speed of light, it would take 30 years to reach it. Then you look back at Earth, and all you could see is how it was 30 years ago from when you are looking back, not thirty years ago from the day you left. All you would see is what Earth was like right after you left.
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