a round, three-dimensional object
A Greek astronomer and philosopher who lived around 350 B.C., suspected that Earth was spherical. He observed that Earth cast a curved shadow on the Moon durning a eclipse.
Earth's axis is the imaginary vertical line around which Earth spins.
the spinning of Earth on its axis
Earth's yearly orbit around the Sun
an elongated, closed curve
the day when the Sun reaches its greatest distance north or south of the equator
occurs when the Sun is directly above Earth's equator
are different forms that the Moon takes in its appearance from Earth
occurs when the Moon is between Earth and the Sun
occurs when all of the Moon's surface facing the Earth reflects light
that more of the illuminated half of the Moon can be seen each night
you see less of its illuminated half each night
more than one quarter is visible
you can only see a thin slice of the moon
occurs when the Moon moves directly between the Sun and Earth and casts its shadow over part of Earth
when Earth's shadow falls on the Moon, a lunar eclipse occurs and a lunar eclipse begins when the Moon moves into Earth' s penumbra
dark, flat regions
depressions caused by meteorites, asteroids, and comets striking the Moon's surface
South Pole Aiken Basin
the largest basin in the solar system and it is 2,500 kilometers under ground and 12 kilometers deep.
When meteorites and other objects strike the Moon, the leave behind depressions in the Moon's surface. The depression left behind by an object striking the Moon is know as an impact basin.