The Universe-> Cluster of Galaxies-> Our Galaxy-> Our Solar System-> The Earth The Universe-Everything astronomers observe, contains huge numbers of galaxies, most of the universe is empty and cold. Cluster of Galaxies-they cluster together in "wispy webs". Our Galaxy(the Milkyway)- is a spiral galaxy (a central buldge with arms extending out, shaped like a disk) Our Solar System-The sun(our star) is central to our solar system which sits on one of the outer arms of the milkyway.
The Earth- (with it's moon)has a crust, mantle and core.
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