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A galaxy disk is a flat star-gas subsystem that resides in a rotating galaxy. The content of the disk includes almost all interstellar gas and young stars.
A galaxy disk is a flat star-gas subsystem that resides in a rotating galaxy. The content of the disk includes almost all interstellar gas and young stars.
Lewis Carroll writes about military space programmes, policy, technology and the industry that supports the sector. He spent nearly two decades covering the military, the Pentagon, Congress and the defence industry as a journalist for Space Chatter magazine.