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Chapters 7-10
Solar System-SSMS
| Term | Definition |
|---|---|
| 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
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