A round depression in the surface of a planet, moon, asteroid, or comet, caused by the impact of a meteoroid.

a chunk of rock that moves through the solar system

the different shapes of the illuminated side of the moon as seen from Earth

event that occurs when the shadow of one body in space, such as a planet or moon, falls on another Umbra the darkest part of a shadow

a region of the moon's shadow that surrounds the umbra and is less dark than the umbra

the regular rise and fall of water in the oceans

a tide at the new or full moon when the change between daily high and low tides is the greatest

a tide at the first or last quarter moon, when there is the least change between daily high or low tides

the four planets closest to the sun (Mercury, Venus, Earth, and Mars), which are similar in structure to Earth

small, rocky solar system bodies, most of which are found orbiting the sun in a region between Mars and Jupiter

region between the orbits of Mars and Jupiter where most asteroids in the solar system are found

a large, massive planet (such as Jupiter, Saturn, Uranus, or Neptune) that is composed mainly of hydrogen and helium

a wide belt beyond Pluto's orbit where objects mostly made of ice and rock orbit the sun

thought to be a very sparse sphere of comets encircling the solar system out to a distance of about 50,000 AU

a cloud of dust and gas that can eventually collapse to form one or more stars with a planetary system

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