A Family Of Planets Crossword Puzzle

QUESTIONS LIST:

• eclipse: an event in which the shadow of one celestial falls on another.
• satellite: a natural or artificial body that revolves around a planet.
• phases: the change in the sunlit area of one celestial body as seen from another celestial body.
• meteor: a bright streak of light that results when a meteoroid burns up in earth's atmosphere.
• comet: a small body of ice, rock, and cosmic dust that follows an elliptical orbit around the sun and gets tail as it passes the sun.
• meteorite: a meteoroid that reaches the earth's surface without burning up completely.
• gas giant: a planet that has a deep, massive atmosphere, such as jupiter, saturn, uranus, or neptune.
• astronomical unit: the average distance between the earth and the sun; approximately 150 kilometers.
• meteoroid: a relatively small rocky body that travels through space.
• terrestrial planet: one of the highly dense planets nearest to the sun; mercury, venus, mars, and earth.
• prograde: a clockwise spin of a planet or moon as seem from above the plants north pole.
• retrograde: the counterclockwise spin of a planet or moon as seem from above the plant's north pole; rotation in the same direction as the sun's rotation.
• inner planet: any of the four planets closest to the sun: mercury, venus, earth, or mars.
• outer planet: any of the four planets with orbits outside the orbit of mars, namely, the planets jupiter, saturn, uranus, and neptune.
• ptolemy: earth center of the universe; around 127-141 a.d.
• copernicus: 1200 a.d.; developed the heliocentric theory.
• newton: universal law of gravity