Cluster - a number of things of the same kind that are together in a group., irregular - uneven, not regular in shape, size, or other characteristics., astronomical - really large; enormous in number size, or distance., spiral - curved in shape; gradually winding around a center point., navigate - to find one's way., constellation - stars that form a pattern or shape that looks like such things as a person, an object, or an animal as seen from Earth., orient - to identify your position in relation to things around you., module - a segment or section of a spacecraft designed to do a specific job. , reusable - when something can be used more than once., attraction - when things are drawn to move closer together., launch - to send a rocket into outer space., observatory - a place used to observe the sun, moon, stars and outer space.,

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