Question

define per sac and light year
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Answer 1

Answer:

A: A parsec, or “parallax second,” is defined as 3.26 light-years because of how it is measured. Earth circles the Sun, making one complete orbit per year. ... And a parsec is the distance — 3.26 light-years — that a star must lie from the Sun for its parallax angle to be exactly 1".

Explanation:

Answer 2

Answer:

Light year is used to measure distance between celestial objects. One parsec is approximately equal to 3.26 light-years. Proxima Centauri, the nearest known star to earth other than the sun, is about 1.3 parsecs (4.24 ly) away, by direct parallax measurement.

Explanation:

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