1) A galaxy with a rotating flattened disk and two or more luminous spiral arms a) galaxy b) spiral galaxy c) Milky Way galaxy d) luminosity 2) a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter  a) nebulae b) Giant c) apparent magnitude d) main‐sequence star 3) The galaxy that contains our solar system a) apparent magnitude b) Hertzsprung‐Russell diagram c) Milky Way galaxy d) spiral galaxy 4) About 90 percent of stars in the universe are this type, including our sun a) electromagnetic spectrum b) apparent magnitude c) main‐sequence star d) galaxy 5) how bright the star appears at a standard distance of 32.6 light-years a) nebulae b) elliptical galaxy c) absolute magnitude d) luminosity 6) how bright the star appears from Earth a) apparent magnitude b) elliptical galaxy c) Milky Way galaxy d) galaxy 7) Luminosity a) Milky Way galaxy b) Giant c) brightness d) galaxy 8) the range of wavelengths or frequencies a) elliptical galaxy b) irregular galaxy c) apparent magnitude d) electromagnetic spectrum 9) a type of galaxy having the shape of a spheroid or ellipsoid, rather than a disk a) elliptical galaxy b) absolute magnitude c) Hertzsprung‐Russell diagram d) galaxy 10) A collection of stars, gas, and dust that make up the visible universe a) galaxy b) brightness c) light year d) Hertzsprung‐Russell diagram 11) A very large, bright non-main-sequence star a) Giant b) apparent magnitude c) nebulae d) Hertzsprung‐Russell diagram 12) a scatter plot of stars showing the relationship between the stars' absolute magnitudes and their temperatures a) irregular galaxy b) brightness c) Milky Way galaxy d) Hertzsprung‐Russell diagram 13) a galaxy that does not have a distinct regular shape a) Milky Way galaxy b) electromagnetic spectrum c) irregular galaxy d) light year 14) the total distance light goes in one year a) Giant b) light year c) nebulae d) irregular galaxy 15) How much radiation is emitted by a celestial source (such as a star) a) luminosity b) galaxy c) main‐sequence star d) light year

Universe Vocabulary

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