Light year or light year

Light year or light year

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He Light year or light year It is a unit of length used in astronomy to measure large distances. It is equal to the distance traveled by light in an average solar year, or more specifically, the distance a photon would travel in a vacuum at an infinite distance from any gravitational field or magnetic field, in a Julian year (365.25 days of 86400 seconds ).

The light year is not a unit of time, but of distance. It takes 8 minutes for light to travel from the Sun to Earth. Our galaxy, the Milky Way, is 100,000 light years in diameter.

Taking a value of 300,000 km / s for the speed of light, a light year is equivalent to 9,461,000,000,000 km in round numbers, or 63,240 Astronomical Units (UA), or also 0,3066 parsecs.

No material object can travel faster than light.

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