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earth sun moon space
| Term | Definition |
|---|---|
| rotation | to spin or turn on an axis |
| Revolution | to travel in a path around another object |
| Orbit | the path an object takes as it moves around another object in space |
| moon phase | the changes in the appearance of the moon as seen from Earth |
| waxing moon phases | the phases of the moon where the moon appears to be growing (the light is increasing) |
| waning moon phases | the phases of the moon where the moon appears to be shrinking; there is less and less light reflected |
| lunar cycle | the different appearances of the Moon caused by the moon's orbit around Earth |
| Gravity | a force that pulls objects toward each other larger objects have a larger Force |
| solar system | a star and all the objects in orbit around it |
| the order of the planets in our solar system | Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune |
| axis | an imaginary line around which a planet rotates |
| day | a period of time lasting 24 hours; the amount of time it takes Earth to make one complete rotation on its axis |
| night | the period of darkness which occurs each day when that part of Earth is facing cold dark space |
| Sun | the star that is at the center of our solar system |
| Earth | the third planet from the Sun; a small, rocky planet unique because it has liquid water ---which enables it to support life |
| Earth's Moon | a natural satellite of Earth in space that revolves around a planet reflecting the Sun's light |
| apparent movement | seening movement of an object when no movement is actually taking place. example - the Sun moving across earth sky |
| crater | bowl-shaped holes on a terrestrial surface typically made by asteroids |
| seasons | one of four periods of the year. order- spring, summer, fall, winter |
| Summer | the season when the northern hemisphere is tilted towards the Sun |
| winter | the season when the northern hemisphere is tilted towards cold dark space |
| northern hemisphere | the half of Earth located above the equator |
| southern hemisphere | the half of Earth located below the equator |
| equator | the imaginary line that separates the Northern Hemisphere from the southern hemisphere |
| high tide | a time when the in flowing water reaches its highest level |
| low tide | the time when ocean water reaches its lowest level |
| shadow | the dark shape made on the ground when an object is blocking sunlight |
| asteroid | a large rocky object that orbits the Sun |
| gas giant | the four planets on the outside of the asteroid belt Jupiter Saturn Uranus Neptune |
| terrestrial planets | the four planets closest to the Sun Mercury Venus Earth Mars |
| asteroid belt | the area between Mars and Jupiter filled with asteroids |
| planet | a large body that moves in an orbit around a star |
| the eight phases of the moon in order | new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter (also called last quarter), waning crescent, and new moon again |
| 12 a.m. | Midnight |
| 12 p.m. | Noon (high noon) |
| East | Where the Sun appears to "rise" |
| West | Where the Sun appears to set |
| rotate | rotation, rotating, rotates |
| revolve | revolution, revolving, revolves |
| duration of moon revolution | about one month |
| duration of earth's rotation on axis | 24 hours |
| duration of earth's revolution around the sun | 365 1/4 days (one year) |
| 23.5° | The tilt of the Earth on its axis |
| Cycle | a sequence of events that is repeated over and over |
| crater | a depression on a rocky surface, like the moon, caused by an impact from another object |
Created by:
mrs. keeton
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