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alekazam
· 3 years ago
· FIRST
“As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days).Because it includes the word "year", the term light-year may be misinterpreted as a unit of time.”
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iccarus
· 3 years ago
but if you had a big enough telescope and managed to put a mirror out there, 10 light years away, . You'd have to wait, but in 20 years, it would be reflecting light back.
1
tlbomb
· 3 years ago
wouldnt you have essentially built a time machine, but for exactly 20 years ago that you cant interact with
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aphelion
· 3 years ago
A closer analogy would be a livestream with 20 years latency.
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tlbomb
· 3 years ago
and no sound
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