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Science Ch.5 Bold Words

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annawalke's version from 2017-09-27 15:39

Section

Question Answer
planets
densitythe mass of a material or object in a single volume unit of the material
eclipticthe sun's apparent path through the stars
eccentricflattened
Johannes Keplergerman astronomer who developed three laws to describe the motion of the planets
perihelionwhen a planet is closest to the sun
aphelionwhen a planet is farthest from the sun
astronomical unit, ua150 million km, 93 million mi
albedoa planets reflective ability
surface gravitythe downward pull the planet exerts on objects at its surface
a newtonthe standard metric unit of force and weight
massa measure of the amount of matter the planet contains
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