the sun together with all the planets and other bodies that revolve around it.

a cloud of interstellar gas and dust.

small celestial bodies fused together to form the planet.

external covering of the earth.

the portion of the earth between the crust and the core.

the central innermost part of the earth.

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science

solar system

Term	Definition
mass	a body of coherent matter.
weight	amount a thing weights
solar system	the sun together with all the planets and other bodies that revolve around it.
nebula	a cloud of interstellar gas and dust.
solar nebula	a molecular cloud.
planetesimal	small celestial bodies fused together to form the planet.
crust	external covering of the earth.
mantle	the portion of the earth between the crust and the core.
core	the central innermost part of the earth.