Space Test
Terms
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- Gravity
- the attraction between Earth and all objects on it
- light year
- the distance that light travels in a year
- revolution
- Earth's yearly orbit around the sun
- rotation
- Earth's spinning on its axis
- elipse
- an elongated, closed curve
- eclipse
- when the sun, moon, and Earth line up perfectly
- crescent
- curved shape of the moon
- gibbous
- when more than half of the moon but less than the full moon is visible
- waning
- illuminated or lit portion of the moon becomes smaller
- waxing
- illuminated/lit portion of the moon becomes larger
- asteroids
- rocks similar to the materials that formed the planets andare scattered through the solar system or in the asteroid belt
- comets
- made of dust, rock, and different types of ice; outside the solar system in the Oort cloud beyond Pluto's orbit
- tides
- repeated rise and fall of water in oceans and lakes every 12.5 hours
- spring tides
- tides that have the greatest difference between high and low tides
- neap tides
- tides that have the least difference between high and low tide
- mass
- measurement of how much matter is in an object
- weight
- a measurement of how hard gravity pulls on an object
- solstice
- when the sun is the greatest distance north or south of the equator
- equinox
- when the sun is directly above the equator
- Why does the moon shine?
- Sunlight reflects off the moon