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Use the diagram to answer the question. An illustration shows the sun and the eight planets. The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. What is the main problem with this model if it were going to be used to study t...

Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point) AU is used in astronomy, while km is used in physics. AU is used in astronomy, while km is used in physics. AU is used for spacing, while km is used for length. AU is used...

Why do astronomers use astronomical units (AU) instead of kilometers (km)?(1 point) AU is used in astronomy, while km is used in physics. AU is used for spacing, while km is used for length. There are no km in outer space, only AU. Large distances are eas...