Noun
-
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)
- astronomical unit -
a soft yellow malleable ductile (trivalent and univalent) metallic element
occurs mainly as nuggets in rocks and alluvial deposits
does not react with most chemicals but is attacked by chlorine and aqua regia
- atomic number 79