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1918 in science
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==Astronomy== * June 8 β [[Nova]] Aquila, the brightest observed since [[1604 in science|1604]], is discovered. * [[Kiyotsugu Hirayama]] identifies several groups of [[main belt]] [[asteroids]], now known as [[Hirayama families]]. * [[Harlow Shapley]] demonstrates that [[globular cluster]]s are arranged in a spheroid or halo whose center is not the [[Earth (planet)|Earth]], but the center of the [[galaxy]]. * [[Heber Curtis]] discovers a [[relativistic jet]] of matter emerging from [[Elliptical galaxy M87]].
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