umbra - the darkest part or inner region of an object's shadow, penumbra - the weaker part of an object's shadow that appears around the umbra, galaxy - a group of solar systems, dust, and gas held together by gravity; our solar system is part of the Milky Way galaxy, heat - the transfer of thermal energy, eclipse - an event whereby one astronomical body passes between two other astronomical bodies, moon - a body in outer space that orbits a planet; a natural satellite, light year - the distance light travels in a vacuum in one year; about 6 trillion miles, Earth - the third planet from the Sun; the planet on which we live (related words: earthly; earth - meaning soil or dirt), equinox - the twice-a-year occurrence during which Earth's axis is perpendicular (at a 90 angle) to a line joining the Sun and Earth's center, solstice - the twice-a-year occurrence during which the Sun appears at the highest point in the sky as seen from the North or South pole, star - a massive ball of gas in outer space that gives off heat, light and other forms of radiation, sun - any star around which planets revolve, telescope - an instrument used to observe objects that are far away, universe - everything that exists in, on and around the Earth,

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