Since light has a finite speed how does it influence our observations of distant stars and galaxies?

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2026-03-28 08:55

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The finite speed of light means that when we observe distant stars and galaxies, we are seeing them as they were in the past, not as they are currently. For example, light from a star that is 10 light-years away takes 10 years to reach us, so we see it as it was 10 years ago. This delay allows astronomers to study the history of the universe and understand its evolution, but it also means that our observations are inherently limited by the distance light has traveled. Consequently, the farther away an object is, the older the information we receive about it.

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