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9th grade science chapter 25
is an imaginary plane containing the Earth's orbit
is a relatively small natural body in space that revolves around a planet
astronomical units (AU
Distance from the sun is measured
are low (dark), flat plains formed by ancient lunar lava flows.
are chunks of rock that move through the solar system.
The different shapes of the moon visible from Earth
the shadow of one body in space, like a planet or moon, falls on another.
darkest part of the moon's shadow
a region of shadow that is less dark than umbra.
the regular rise and fall of ocean waters
are planets similar in structure to Earth
is a wide belt that extends from Pluto's orbit out to about 100 AU or more from the sun.