A star and all the palnets and other objects that revolve around that star.
A large bidy that revolves around a star.
The path one body takes in space as it revolves around another body.
The nearly circular (slightly oval) path the Earth takes in space as it revolves around the sun. p. 34
The spin on an axis.
An imaginary line that passes through Earth's center and its North and South Poles.
Ahuge ball of very hot gasses in space.
The star at the center of our solar system.
A grouping of gas, dust, and many stars, plus any objects that orbit stars.
Any body that orbits another.
A body (as the moon) shaped like a ball.
The gas surrounding a celestial body.
To move or shift so as to slant or tip.
The attraction of bodies to the center of the Earth.
A period of 24 hours beginning at midnight; created by the Earth rotating on its axis.
The period of 365 1/4 days required for the Earth to make on complete revolution around the sun.
the watery areas of the earth, including oceans, lakes, rivers, and other bodies of water. (3/4 of Earth covered in water)
the outermost, rigid layer of the Earth that consists of the crust and the rigid upper part of the mantle