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How are telescopes time machines?

Answer 1

Light have a definite velocity in vacuum..It is about 300,000 kilometers/second.

The ability of telescopes to gather more light from faint objects allows us to see objects that are farther away. When you see a star, photons from that star travel a certain distance before reaching your retina, so if you are 100 light years away, the photons you saw from that star started 100 years ago. Therefore, when you look at a far-off star, you are seeing back in time, which is why we say we are seeing back in time.

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Answer 2

Levi Acosta

Telescopes act as time machines by capturing light that has traveled over vast distances, allowing us to observe celestial objects as they appeared in the past.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.