At the center of the solar system - Sun, Stars that only seem to be grouped close together - constellations, Measurement of the distance light can travel in a year - light year, Hundreds of billions of stars clustered together - galaxy, A cloud of gas and dust which new stars are formed - nebula, A gigantic explosion that occurs near the end of the life of high mass stars - supernova, the earliest stage of a star - protostar, The shape our galaxy is - spiral, The three factors that determine the magnitude of a star - distance, temperature and size, A point in space that has such a strong force of gravity that nothing can escape - black hole, the sun together with the group of celestial bodies that are held by its attraction and revolve around i - solar system, Stars are huge, glowing balls of gases that gives off its own light - star, when the Moon moves into the Earth's shadow. - lunar eclipse, a complete or partial hiding of the sun caused by the moon's passing between the sun and the earth - solar eclipse,

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