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Theory of language is a topic in philosophy of language and theoretical linguistics. The theory of language seeks to understand how language is acquired and used by individuals and communities. Linguists are divided into different schools of thought which generally fall along the lines of the natureā€“nurture debate.

Uranus is the seventh planet from the Sun. It is the third largest by diameter and fourth largest by mass. Uranus is similar in composition to Neptune, and both have bulk chemical compositions which differ from that of the larger gas giants Jupiter and Saturn. For this reason, scientists often classify Uranus and Neptune as "ice giants" to distinguish them from the other giant planets. It is named after Uranus, the Greek god of the sky and progenitor of the other gods. Sir William Herschel formally discovered the planet on March 13, 1781, making it the first planet discovered in the modern era.