The correct answer is: d. AU is used in astronomy while km is used in physics.
Astronomers use astronomical units (AU) because they are a convenient unit of measurement for distances within the solar system. AU represents the average distance between the Earth and the Sun, which is approximately 149.6 million kilometers. Using AU helps to simplify the expression of distances within our solar system, as the distances involved can be very large.
On the other hand, kilometers (km) are commonly used in physics and everyday life to express distances on Earth. Since physics deals with various aspects of the physical world, including distances on Earth, km is a more appropriate unit for this context.
In summary, astronomers use AU to measure distances within our solar system, while kilometers are more commonly used for distances on Earth in physics and everyday life.
why do astronomers use astronomical units au instead of kilometers km a. there are no km in outer space only au b. larger distances are easier to express in au than km c au is used for spacing while km is used for length d. au is used in astronomy while km is used in physics
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