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Mega is a unit prefix in metric systems of units denoting a factor of one million (10 6 or 1 000 000). It has the unit symbol M . It was confirmed for use in the International System of Units (SI) in 1960.
1 km 2 means one square kilometre, or the area of a square of 1000 m by 1000 m. In other words, an area of 1 000 000 square metres and not 1000 square metres. 2 Mm 3 means two cubic megametres, or the volume of two cubes of 1 000 000 m by 1 000 000 m by 1 000 000 m, i.e. 2 × 10 18 m 3, and not 2 000 000 cubic metres (2 × 10 6 m 3).
Before the adoption of ronna and quetta for 10 27 and 10 30 and ronto and quecto for 10 −27 and 10 −30 in November 2022, many personal, and sometimes facetious, proposals for additional metric prefixes were formulated. [12] [13] The prefix bronto, as used in the term "brontobyte", has been used to represent anything from 10 15 to 10 27 ...
mega-, a metric prefix denoting 10 6; Mega (number), a certain very large integer in Steinhaus–Moser notation "mega-" a prefix meaning "large" that is used in taxonomy; Gravity assist, for Moon-Earth gravity assist and Mars-Earth gravity assist
10 6: mega-(MW) 1.3 × 10 6 W tech: power output of P-51 Mustang fighter aircraft 1.9 × 10 6 W astro: power per square meter potentially received by Earth at the peak of the Sun's red giant phase 2.0 × 10 6 W tech: peak power output of GE's standard wind turbine 2.4 × 10 6 W
As 1024 (2 10) approximates 1000 (10 3), roughly corresponding to the SI prefix kilo-, it was a convenient term to denote the binary multiple. In 1999, the International Electrotechnical Commission (IEC) published standards for binary prefixes requiring the use of megabyte to denote 1000 2 bytes, and mebibyte to denote 1024 2 bytes.
10 9: mega M 1 000 000: 10 6: kilo k 1 000: 10 3: hecto h 100 10 2: deca da 10 10 1 (none) (none) 1 10 0: ... which means that they involve only products of powers of ...
The Gould Belt of stars, including the Sun (1.2 × 10 6 M ☉) [164] 7–8 × 10 36 kg The supermassive black hole at the center of the Milky Way, associated with the radio source Sagittarius A* (3.7±0.2 × 10 6 M ☉) [165] 8 × 10 36 kg Omega centauri, the largest globular cluster in the Milky Way, containing approximately 10 million stars ...