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asteroid. a small rocky object in space. axis. a line through the center of a sphere or planet. comet. an object in space that is made mostly of ice and dust and may appear to have a “tail”. eclipse.
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asteroid • a small rocky object in space
axis • a line through the center of a sphere or planet
comet • an object in space that is made mostly of ice and dust and may appear to have a “tail”
eclipse • the hiding of a planet or the moon by the shadow of another; a way in which planets, moons, and stars (such as the Sun) line up so that one creates a shadow hiding the view of another
ecliptic • the plane of Earth's orbit around the Sun
elliptical • shaped in an oval
gibbous • showing more than half, but not the whole, especially of the moon
gravity • the pull of the earth on an object; a mutual physical force attracting two bodies, such as planets; the force of attraction between two or more objects, the strength of which is determined by mass and distance
orbit • a path that circles around something, especially a body in space such as a planet
planet • a large body in space that rotates around a star and does not give off light itself, but reflects light from the star
rotation • a spin; a turn around something
satellite • an object that goes around a larger body; an object that goes around a planet and is held in orbit by gravity Satellites can be natural, like the moon (left), or man-made like this weather satellite (right).
tide • the rising and falling levels of the ocean that happens twice each day
wane • to shrink or become smaller
wax • to grow and become larger