There are a few ways space can be measured within our solar system, Km (
kilometer), Au (astronomical unit), and Ly (light year).
Kilometer is the smallest form of
measurement, spanning only 3,280 ft. One astronomical unit spans 150 million
kilometers and shows the distance between the sun and earth. Light travels at 186,00 mi/sec., so in one light year we could travel 6,000,000,000,000m. We can use the form of
measurement, Km to measure a state to a state. We could use the form of
measurement AU to measure the distance from the sun and earth. And we can use the form of
measurement, Ly to measure between galaxies.
Earth is
approximately 628,743,036 km from Jupiter's moon Callisto. In order to actually get to
Callisto it would take about 6 years if the spacecraft you were traveling in went thousands of miles per hour. Humans can get to
Callisto and have.
This picture shows one AU.
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