Light-Year Explained: From Our Solar System to the Edge of the Universe #space #universe #earth

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A light-year is not a unit of time but a unit of distance—the distance light travels in a vacuum in one year, about 9.5 trillion kilometers. To compare, light takes 1.3 seconds to reach the Moon, 8 minutes to reach Earth from the Sun, and just over 4 hours to reach Neptune.

The nearest star to the Sun is about 4.25 light-years away, a journey that would take Voyager 1 around 70,000 years. Even this is tiny compared to our galaxy’s size of 100,000 light-years, which itself is small compared to the observable universe spanning 93 billion light-years.

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