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SCIENCE CH 7
The Moon
| Term | Definition |
|---|---|
| Moon's diameter | 3476km |
| Moon's orbit | 29.5 days |
| Moon's surface gravity | 1/6 as great as the Earth's |
| Escape velocity | The initial speed an object must have in order to free itself from the gravitational pull by a planet or other celestial body |
| Moon's escape velocity | Very low 2.4 km/s |
| Terminator | The line dividing the lightened side of the moon from the dark side |
| Crater | Greek word for cup. They are round and steep |
| Tycho | Located near the moon's south pole |
| Rays | Bright streaks |
| Maria | Dark areas on the moon, referred to "lunar seas" |
| Early astronomers | thought that maria were bodies of water in the moon |
| rills | long, narrow valleys |
| mountians | rise to heights of 8km |
| moons orbit | elliptical |
| moons average distance to the center | 384,400 km |
| perigee | moon's point of closest |
| apogee | most distant point |
| new moon | when the moon is in the same direction as the sun |
| waxing crescent | phases of the moon |
| cusps | horns of the crescent moon |
| first quarter | 90 degrees to the east from the sun in the sky |
| waxing gibbous | between first quarter and full moon |
| full moon | 180 degrees away from the sun |
| harvest moon | full moon that occurs nearest to the autumnal equinox |
| hunters moon | the full moon occurring after the crops have been harvested |
| waning gibbous | phase occurs during the 3rd week |
| third quarter | 22 1/8 days, western part of the moon is dark |
| waning crescent | between 3rd and new moon |
| solar eclips | when the moon comes between the earth and the sun. This prevents the sun from giving light to the earth |
| total eclipse | occurs on a narrow area on the earth's surface that falls completely within the umbra of the moon's shadow |
| partial eclipse | moon covers part of the sun |
| annular eclipse | ring shaped portion of the sun's disk shown around the moon |
| bailey's beads | bright pinpoints of light caused by sun light shinning through valleys at the moon's edge |
| diamond ring affect | bringing sparkling bead along the remaining thin solar crescent |
| lunar eclipse | when the moon passes into the earth's shadow |
| the capture theory | the idea that the moon was once a planet traveling around the sun in it's own orbit |
| the fission theory | the idea the the moon spun off from the earth. some have even said that it was ripped out of the Pacific ocean |
| the accreditation theory | the idea that the earth and moon both came from the same cloud of dust and gas |
| the impact theory | that a planet the size of mars struck the earth a glancing blow very earthy in its history |
Created by:
Nymphadora Tonks
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