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To help compare different distances this section lists lengths starting at 10 9 meters (1 gigameter (Gm) or 1 billion meters). 1.2 Gm – separation between Saturn and Titan; 1.39 Gm – diameter of Sun [169] [170] 1.5 Gm – orbit from Earth of the James Webb Space Telescope; 1.71 Gm – diameter of Alpha Centauri A, one of the closest stars ...
A unit prefix is a specifier or mnemonic that is prepended to units of measurement to indicate multiples or fractions of the units. Units of various sizes are commonly formed by the use of such prefixes.
Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic.Each prefix has a unique symbol that is prepended to any unit symbol.
In English, the prefix giga can be pronounced / ˈ ɡ ɪ ɡ ə / (a hard g as in giggle), or / ˈ dʒ ɪ ɡ ə / (a soft g as in gigantic, which shares giga 's Ancient Greek root). [5] A prominent example of this latter pronunciation is found in the pronunciation of gigawatts in the 1985 film Back to the Future.
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Lengths between 10 −10 and 10 −9 m (100 pm and 1 nm).. 100 pm — 1 angstrom; 100 pm — covalent radius of sulfur atom [9] 120 pm — van der Waals radius of a neutral hydrogen atom [10]
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