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Noun
1. earth mass (astronomical unit of mass)
Wikipedia definition
2. Earth massEarth mass (M⊕) is the unit of mass equal to that of the Earth. 1 M⊕ = 5.9722 × 10 kg. Earth mass is often used to describe masses of rocky terrestrial planets. The four terrestrial planets of the Solar System, Mercury, Venus, Earth, and Mars, have masses of 0.055, 0.815, 1.000, and 0.107 Earth masses respectively.
Read “Earth mass” on English Wikipedia
Read “地球質量” on Japanese Wikipedia
Read “Earth mass” on DBpedia

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