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[deleted] OP t1_j7vbwgt wrote
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AlunWH t1_j7vbz9e wrote
The closest planet outside our solar system is Proxima Centauri B.
Proxima Centauri B is 4.2 light years away. That may not sound that much, but it’s actually about 25 trillion miles. That’s 25,000,000,000,000.
The space shuttle Discovery could travel five miles a second. At 5 miles a second it would take 37,200 years to travel just one light year. One. So Proxima Centauri B is more than a hundred thousand years away for us.
A light year may not sound much, but it’s massive.
[deleted] OP t1_j7vc0u0 wrote
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JackBMo t1_j7vc3lb wrote
A light year = the amount of time it takes for light to travel in a year. If we could travel at light speed it would take 642 years to reach Betelgeuse. However we can not even come close to those speeds. So it would take a lot, a lot longer.
[deleted] OP t1_j7vc4f5 wrote
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topcat5 t1_j7vc58y wrote
You are correct if you are asking if that's how long it would take light to reach those places from the Earth.
Of course there's no known technology that would even begin to allow us to approach those speeds for travel.
holdmeinthedark t1_j7vcarl wrote
Thank you! This helps me understand things a bit better.
dbarrc t1_j7vcatx wrote
it would take 200 Earth years of moving at the speed of light, to travel to said object.
triffid_hunter t1_j7vd6pd wrote
> Now if an object is lets say 200 light years away, would it take 200 (Earth years) to travel to said object?
It would take 200 years for photons or other massless particles (eg gravity waves) to travel from there to here or vice versa - but it would take a manmade spaceship hundreds to thousands of millenia because we don't have yet any rocket engines efficient enough to get there faster.
packetfire t1_j7vbup3 wrote
It would take 200 years(or 642 yrs) if and only if one could travel at the speed of light, which is not gonna happen, so that's the time delay between "now" and what we are seeing for each object. Actual TRAVEL times for humans are far, far longer.