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Answer :
Answer:
If a star explodes 15 Light Years away, we will see the explosion 15 years from now. If it's 100 light years away, 100 years and so on and so on.
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Rewritten by : Brahmana
We will see the explosion of a star that is 15 light-years away 15 years after the event, due to the time it takes for light to travel from the star to Earth.
If a star explodes 15 light-years away, we will see the explosion 15 years after it actually occurs. This is due to the fact that light travels at a constant speed of approximately 300,000 kilometers per second, which covers the distance of one light-year in a year. Therefore, the explosion's light will take 15 years to reach us, making the lookback time 15 years. So if a star at that distance exploded today, we wouldn't learn of it or see it from Earth until 15 years into the future.
This concept explains the reason we see celestial events as they were in the past, not as they are in real-time. For a star that's 100 light-years away, the light we observe tonight left that star 100 years ago. Similarly, any changes in that star will not be known to us until 100 years after they occur.