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Solar System
| Term | Definition |
|---|---|
| Mass | a considerable assemblage, number, or quantity: a mass of errors; a mass of troops. Synonyms: collection, accumulation, pile, conglomeration |
| Weight | the amount or quantity of heaviness or mass;amount a thing weights |
| Solar System | the sun together with all the planets and other bodies that revolve around it |
| Nebula | Also called diffuse nebula. a cloud of interstellar gas and dust. Compare dark nebula, emission nebula, reflection nebula. |
| Solar Nebula | a system that suround the dark |
| Planetesimal | one of the small celestial bodies that, according to one theory (planetesimal hypothesis) were fused together to form the planets of the solar system |
| Crust | the outside of the earth |
| Mantle | the inner core of the earth |
| Core | the very middle of the earth |