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39 Cards in this Set
- Front
- Back
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Law of Universal Gravitation |
every object in the universe attracts every other object, depending on their masses and distances from each other |
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Solstice |
the two days of the year in which the sun's most direct rays reach farthest north of farthest south |
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Equinox |
the two days of the year when day and night are almost the same length everywhere on Earth |
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Crescent |
the moon phase in which we see less than half of the moon's sunlit side |
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Gibbous |
the moon phase in which we see more than half, but not all, of the moon's sunlit side |
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Wax |
to grow |
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Wane |
to shrink |
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Lunar Eclipse |
an event that occurs when Earth passes directly between the sun and the moon, causing the Earth's shadow to block the sun's light from the moon |
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Solar Eclipse |
an event that occurs when the moon passes directly between the sun and Earth, causing the moon's shadow to block the sun's light from a portion of Earth |
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Tide |
the periodic rising and falling of the surface level of ocean water |
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Spring Tide |
a condition of the greatest difference between low and high tides |
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Neap Tide |
a condition of the least difference between low and high tide |
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Mare |
a dark flat area on the moon's surface, filled with hardened lava |
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Crater |
A large round depression from the impact of a meteroid |
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Newton's First Law of Motion |
The tendency for an object to stay in motion or to stay at rest unless acted upon by an outside force |
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Orbit |
The path an object follows as it revolves around another object |
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meteroid |
A small rocket fragment from an asteroid or comet |
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weight |
measure of the pull of gravity |
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Mass |
Measure of how much matter is within an object. Mass combined with its distance from another object affects gravitational pull |
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Axis |
Imaginary line that Earth spins on at 23.5 degree angle |
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Earth's rotation |
Takes one day |
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Earth's revolution |
365.24 days it dates for the earth to make one revolution |
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Moon's gravity |
1/6 of the earth's gravity since it has a smaller mass |
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Equinox |
Occurs when neither hemisphere is tilted toward the sun |
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Solstice |
Takes place due to the maximum tilt of the Earth's axis toward and then away from the sun |
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Winter solstice |
Winter for the Northern Hemisphere and summer for the Southern Hemisphere |
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Seasons |
Determined by the earth's tilted axis as it revolves around the sun |
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Tides |
There are two areas on Earth where high or low tides occur at the same time |
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Solar Eclipse |
Only occurs during a new moon because the moon is directly between the sun and the earth |
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Lunar Eclipse |
Only happens during a full moon because the earth is directly between the sun and the moon. |
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Partial or Total Eclipse |
Determined by whether or not the sun, earth and moon are directly lined up |
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Neil Armstrong |
First person to walk on the moon |
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Moon's Surface |
No liquid water, no wind, no atmosphere. Extreme temperatures |
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Near side |
The side of the moon we can always see is the sunlit side. |
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Gravity and Inertia |
Keep the earth from being pulled into the sun or being hurled through space in a straight line. |
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Gravity, Inertia, Mass, Distance |
Four factors that influence the motions of the earth and moon. |
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Craters, Maria, Highlands |
The moon's three features |
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New Moon, Waxing Crescent, First Quarter, Waxing Gibbous |
Four phases of the new moon |
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Full Moon, Waning Gibbous, Third Quarter, Waning Crescent |
phases of the full moon |
