Science Chapter D3
Terms
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- phases
- A stage in the changing shape that the moon seems to have when it is viewed from Earth
- asteroid
- A chunk of rock and metal, smaller than a planet and larger than a meteroid that orbits the sun
- third quarter
- The warning phase of the moon viewed from Earth where half of the moon's lit side is visible
- first quarter
- The waxing phase of the moon viewed from Earth where half the moon's lis side is visible
- meteoroid
- A chunk of material smaller than an asteroid that orbits the sun
- rotation
- the turning of an object on an axis
- orbit
- The path an object follows as it revolves around another object
- axis
- An imaginary line through the Earth's center from the North Pole to the South Pole
- axial tilt
- The angle that a planet's axis is tilted from vertical
- ellipse
- An oval-shaped path
- planetary system
- A system of planets that revolve around a star
- revolution
- The movement of one object in an orbit around another object
- season
- A period of the year with a certain level of temperature and type of weather
- comet
- A ball of ice, rock and frozed gases that orbits the sun
- astronomical unit
- A measurement equal to the distance between the Earth and the sun, a distance of about 150 million km or 93 million miles