Front

Periodic rise and fall of ocean water level

Back

tide

Front

Partial or total blocking of one object in space by another

Back

eclipse

Front

Apparent shapes of the moon from Earth

Back

phase

Front

Tendency of an object to resist motion change

Back

inertia

Front

Scientific law stating every object attracts every other object

Back

law of universal gravitation

Front

Attractive force between objects

Back

gravity

Front

Path of an object revolving around another in space

Back

orbit

Front

Movement of an object around another

Back

revolution

Front

Spinning motion of a planet on its axis

Back

rotation

Front

Imaginary line around which a planet rotates

Back

axis