Appearances aside, the stars are not eternal and the planets do not move with clockwork precision. For these reasons, one astronomer is proposing that his colleagues ditch the astronomical unit, or AU ...

(Phys.org)—Members of the International Astronomical Union have voted to approve a change to the definition of the famous "astronomical unit" aka, AU, from one based on variable data, to a definite ...

The sun still shines as bright, but according to the International Astronomical Union (IAU), its precise distance from us has just changed. At a recent meeting of the IAU in Beijing, China, members ...

- a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers) ...