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Astronomy Review Sheet Don’t forget to study your worksheet packet, too! Major Vocabulary: - Astronomy- study of out space (planets, stars, moons) - Solar System- the Sun, the planets, and their moons - Spherical- round shaped like a ball - Atmosphere- layer of gas found around some planets (including Earth) - Inertia- a moving object will keep moving in a straight line until another force acts on it - Gravity- the pull between two objects (the bigger object wins) - Orbit- the path a planet takes around the Sun - Revolution- one trip of a planet around the Sun - Rotation- the spinning of a planet on its axis - Axis- the imaginary line through a planet from the North to South pole. (The Earth’s axis is tilted 23.5◦ towards the North Star) - Elliptical- the oval shape of the planets’ orbits - Intensity- how strong/ how much (refers to amount of sunlight) - Terrestrial- planets that are made of earth/rocks o Mercury, Venus, Earth, Mars - Gaseous- planets that are made of gases o Jupiter, Saturn, Uranus, Neptune - Phases- different stages or parts - Crescent- the skinny piece of the moon in the sky - Gibbous- the almost full moon (like a big belly) - Waxing- when the moon appears to grow in size - Waning- when the moon appears to shrink in size Main Concepts: - Order of the Planets - Rotation and Revolution of the Planets - Characteristics of the Planets - Characteristics of Earth (atmosphere, 70% water, rock) - Why the Planets’ Orbit (inertia and gravity) - The Earth’s Seasons - The Earth’s Day and Night - Order of the Phases of the Moon - Our Star, the Sun