What is a galaxy?, A single star, A huge system of stars and dust held together by gravity, A group of planets only, A cloud in the sky, What does the universe include?, Only Earth, Only stars, Everything in space, Only galaxies, A star is:, A cold rock, A huge ball of hot glowing gases that releases energy, A frozen planet, A small moon, The Sun is an example of:, Planet, Star, Galaxy, Constellation, A light-year measures:, Time, Distance, Speed, Weight, A light-year is:, Distance light travels in one year, Time Earth takes to spin, Distance to the Moon, Distance between stars in a constellation, A constellation is:, A group of planets, A group of stars forming an imaginary pattern in the sky, A single bright star, A group of galaxies, Constellations help people to:, Cook food, Find patterns and directions in the night sky, Measure temperature, Make light, Galaxies are held together by:, Wind, Gravity, Light, Heat, The universe is:, Smaller than a galaxy, Bigger than a galaxy and contains all galaxies, Only stars and planets near Earth, Only empty space.

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