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Chapters 7-10

Solar System-SSMS

TermDefinition
astronomy the study of the moon, stars, and other objects in space
axis an imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
rotation a complete turn around a central point
revolution the movement of an object around another object
orbit the path of an object as it revolves around another object in space
solstice the two days of the year on which the sun reaches its greatest distance north or south of the equator
equinox the two days of the year on which neither hemisphere is tilted toward or away from the sun
gravity the attractive force between objects
gravitational force the force of gravity
atmosphere a mass of gases that surround a planet or star
craters a large round pit caused by the impact of a meteoroid
phases one of the different apparent shapes of the moon as seen from Earth
solar eclipse the blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth
lunar eclipse the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
neap tide the tide with the least difference between consecutive low and high tides
spring tide the tide with the greatest difference between consecutive low and high tides
umbra the darkest part of a shadow
penumbra the part of a shadow surrounding the darkest part
geocentric a model of the universe in which Earth is at the center of the revolving planets and stars
heliocentric a model of the solar system in which Earth and the other planets revolve around the sun
ellipse an oval shape, which may be elongated or nearly circular
core the central region of the sun, where nuclear fusion takes place
velocity speed in a given direction
satellite an object that revolves around another object in space
space probe a spacecraft that has various scientific instruments that can collect data, including visual images, but has no human crew
space shuttle a spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose
space exploration exploring space
rover a small robotic space probe that can move about the surface of a planet or moon
remote sensing the collection of information about Earth and other objects in space using satellites or probes
vacuum a place that is empty of all matter
microgravity the condition of experiencing weightlessness in orbit
Created by: autumn.crandall