Reynolds Honors Science Chapter 19 Test
Terms in this set (32)
the study of the moon, stars, and other objects in space
the imaginary line that passes through Earth's center, and North and South Poles
Earth's spinning on its axis
the movement of one object around another object
Earth's path as it revolves around the sun
the distance north or south from the equator, measured in degree's
one of two days each year, the noon sun is overhead at either 23.5 South or 23.5 North (degrees north or south)
this only occurs two days out of the year. One of these days the sun is directly overhead at the equator
also known as spring equinox, marks the beginning of spring in the Northern Hemisphere
marks the beginning of fall in the Northern Hemisphere
the different shapes of the moon you see from earth
occurs when an object in space comes between the sun and a third object, and casts a shadow on that object
when the moon passes between earth and the sun, blocking sunlight from earth
the darkest part of the moon's shadow
less dark than the umbra, it is the largest part of the shadow
occurs at a full moon when Earth is directly between the moon and the sun
the rise and fall of water every 12.5 hours or so
the force that pulls the moon and Earth toward each other
any natural or artificial object that revolves around an object in spaces
means some satellites revolve around the Earth at the same speed Earth revolves
two lenses in a wooden tube
round pits in the moon's surface
dark, flat area's on the moon's surface.
Process that causes day and night
Earth's rotation on its axis causes day and night. As Earth rotates eastward, the sun appears to move westward across the sky. As Earth continues to turn eastward, the sun sets in the west. Sunlight can't reach the side of Earth facing away from the sun, so it turns to nighttime there
Two factors that cause Earth to have seasons
The cycle of seasons is caused by the tilt of Earth on it's axis. Second, Earths orbit as it revolves around the sun
Why the moon changes phases
Phases are caused by changes in the relative positions of the moon, Earth, and sun. Because the sun lights the moon, half the moon is almost always in the sunlight. However, since the moon revolves around Earth, you see the moon from different angles. The phase of the moon you see depends on how much of the sunlit side of the moon you see
Relative positions of the Earth, Sun, and Moon during a lunar or solar eclipse
During a solar eclipse, the moon passes between Earth, and the Sun, blocking sunlight from reaching Earth. The moon's shadow hits Earth. The umbra being the darkest part of the shadow, and the penumbra the lighter part of the shadow. A lunar eclipse occurs at a full moon when Earth is directly between the moon and the sun. Earth blocks sunlight from reaching the moon, and the moon is now in Earth's shadow, making it look dark from Earth.
Why days and years are the same length on the moon
They are the same length because the moon revolves around the Earth at about the same rate that it rotates on its own axis.
What the craters on the moon were caused by
Description of the shape of Earths orbit
a slightly flattened circle or oval shape.
How much time it takes the moon to revolve around the Earth once.
Why only one side of the moon is visible from Earth
the moon is in a geosynchronous orbit around the Earth
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