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Star Cluster , Star clusters are groups of stars that occur close to each other in space (and, thus, are gravitationally bound to one another), appear to have rough… Star Anise , Star anise Milky Way , On a clear, moonless night, away from the bright lights of the city, the Milky Way is visible—a fuzzy, milky band stretching across the sky. The Milk… Galaxy , Galaxy
A galaxy is a large collection of stars, glowing nebulae (clouds), gas, and dust bound together by gravity. Many scientists now believe that a… Variable Star , Variable stars are stars that vary in brightness over time. In most cases, these changes occur very slowly over a period of months or even years. In… Hertzsprung-russell Diagram , Hertzsprung-Russell Diagram
A Hertzsprung-Russell diagram, or HR diagram, is a graph of stellar temperatures (plotted on the horizontal axis) and lum…
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