How is an astronomical unit (AU) defined? Give an example of a situation in which this unit of measure would be conven-ient to use.
Answers
astronomical unit (AU, or au), a unit of length effectively equal to the average, or mean, distance between Earth and the Sun, defined as 149,597,870.7 km (92,955,807.3 miles). Alternately, it can be considered the length of the semimajor axis—i.e., the length of half of the maximum diameter—of Earth’s elliptical orbit around the Sun. The astronomical unit provides a convenient way to express and relate distances of objects in the solar system and to carry out various astronomical calculations. For example, stating that the planet Jupiter is 5.2 AU (5.2 Earth distances) from the Sun and that Pluto is nearly 40 AU gives ready comparisons of the distances of all three bodies.
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The Sahara is a hot desert covering a large part of North Africa. Ladakh is a cold desert lying in the Great Himalayas, on the eastern side of Jammu and Kashmir. ...
