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Terametres are almost never seen in practical use, because they are too big for any terrestrial application, and astronomers have been long accustomed to use millions of kilometers and astronomical units (AU) instead.

• 1 Tm is equal to 6.685 AU
• the mean radius of Saturn's orbit is 1.43 Tm
• the mean radius of Neptune's orbit is 4.50 Tm
• as of January of 2004, the Voyager 1 probe was at a distance of 13.5 Tm from the Sun
• light travels the distance of 1 terametre in 55 min 36 s

See also: 1 E12 m, SI, metre, SI prefix, Orders of magnitudeAn order of magnitude is the class of bigness, the class of size, the class of magnitude, of any amount, where each separate class contains ten times larger amounts than the one before. It is generally used to make very approximate comparisons. If two num, light yearA light year abbreviated ly is the distance light travels in one year: roughly 9. 46 × 1012 kilometres (9. 46 petametres, or about 5. 88 × 1012 miles). More specifically, a light year is defined as the distance that a photon would travel, in free space an, parsecThis article is about the unit of length. In computer programming, Parsec is an XML syntax analyzer, like Lark, or a parsing library for the Haskell programming language. There's an open source computer game named Parsec . The parsec (abbreviated pc is a