అర్థం : 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.

అర్థం : 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).