1 year. A light year is a measure of distance, not time. Its how far light travels in 1 year, so the time is the same. Unless your talking some kind of weird Einstein theory about time bending at such speeds... then I have no idea.
Traveling 40 light years would take 40 years at the speed of light.
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You CAN'T go AT the speed of light. In theory, it might be possible to travel CLOSE to the speed of light; in which case, the answer is yes - since time passes much slower for you. From your point of view, the distances in the direction you are traveling would get much shorter.
It depends upon what units you are working in. It depends on how much mass is involved. A single electron traveling at near the speed of light will not hurt you - doubtful that you would even feel it. If it struck the retina of the eye you might see a flash of light. A 300000kg granite block traveling at 1 meter per second is deadly. Anything near your own bodily mass traveling at 2 m/s is approaching dangerous levels of momentum.
That would depend on where you began your journey from.
You would be much heavier than normal. The mass of any object increases as its speed goes up.
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Traveling 600 million light years would take an impossibly long time, considering the current limits of our technology. Even traveling at the speed of light (which is not feasible for matter with mass), it would still take 600 million years to cover that distance. The vastness of space makes interstellar travel on such a scale unrealistic with our current knowledge and technology.
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How much does a traveling Radiographer make in Australia?
Traveling 20 million light years at the speed of light would take 20 million years. Since we do not currently have technology that can travel at the speed of light, it would take much longer using current spacecraft technology.
The nearest star to Earth, Proxima Centauri, is approximately 4.24 light-years away. Traveling at 100 miles per hour, it would take about 81,000 years to reach Proxima Centauri, as light takes about 4.24 years to cover that distance. Given the vast distances in space, even traveling at high speeds by earthly standards is still vastly insufficient for interstellar travel.