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Sun- Earth- Moon

TermDefinition
Satellite A body that orbits a planet
Star A giant ball of superheated gas, or plasma, composed of hydrogen and helium
Meteor A small piece of rock or ice that burns up as it enters Earth’s atmosphere
Comet A cold mixture of dust and ice that develops a long trail of light
Sun Largest object in our solar system
Geocentric Earth’s-centered model
Heliocentric Sun-centered model
Astronomy The study of space
Planet Spherical, orbits the sun, with a larger mass then nearby objects
Ellipse Oval shape of the planets’ orbits
Axis An imaginary line that passes from the North Pole to the South Pole.
Revolution The movement of one object around another
Orbit Planets path around the sun
Solstice Earth is most tilted toward or away from the sun which causes the longest or shortest daylight of the year
Equinox Earth is not tilted toward the sun which causes equal day and night
Gravity This force that attracts all objects towards each other
Law of universal gravitation Every object attracts every other and its force depends on mass and distance
Inertia Force that keeps resisting a change in motion
Rotation The spinning of Earth on its axis
Phase Different shape of the moon you see
Solar eclipse When the moon passes directly between the Earth and sun during a new moon
Lunar eclipse Occurs during a full moon when Earth is directly between the moon and sun
Umbra Darkest part of a shadow where light is completely blocked
Penumbra Area of a shadow where light is partially blocked
Tide Daily rise and fall of ocean water
Spring tide Higher high tides during full and new moons
Neap tide Lower high tides during the first and third quarter moons
Maria Dark, smooth, lava covered areas on the moon
Highlands Higher lighter areas on the moon covered with craters
Weight Force of gravity on an object
Created by: user-1979320
 

 



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