Inside our Solar System distances are measured in Astronomical Units (AU) which is the average distance from the Earth to the Sun, or about 93 million miles. Jupiter is about 5.5 AU distance from the sun or around 500 million miles. Distances outside our Solar System are usually measured in Light Years.
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Light years
The metric system is used to measure distance in Brazil. Distances are typically measured in kilometers (km) and meters (m).
The most commonly used unit to measure distances beyond our solar system is the light-year. This unit is the distance that light travels in one year in a vacuum, equivalent to about 9.46 trillion kilometers.
No. A light year measures such large distances that it would be highly impractical to measure anything on Earth. The light year is used to measure distance in space beyond the solar system.
For the same reason you wouldn't use a ruler to measure a paramecium. A lightyear is the distance that light travels in a year, about 6,000,000,000,000 miles. The reason it isn't used inside of our solar system is, simply, because the solar system isn't that big.