Planets rotate on own axis.

Meaning: Planets turn around an imaginary line that passes through their centers.

Choice of Words: Planets are large objects that move around the Sun. Rotate means to turn around an axis. On means in contact with or supported by a surface. Own means belonging to a particular person or thing. Axis is an imaginary line that passes through the center of a planet or other object and around which it rotates.

Alternative Expressions

Planets spin around themselves.

Meaning: This means that the planets are moving in a circular motion around their own centers, just like a top that spins on its point.

Choice of Words: "Planets" are the big balls of rock and gas that orbit stars. "Spin" means to turn around and around. "Themselves" means the planets are turning around their own centers.

Planets turn on their own middle.

Meaning: This means that the planets are moving in a circular motion around their own centers, just like a wheel that turns on its axle.

Choice of Words: "Planets" are the big balls of rock and gas that orbit stars. "Turn" means to move around a center point. "Their own middle" means the center point of each planet.

Planets go around and around their own center.

Meaning: This means that the planets are moving in a circular motion around their own centers, just like a merry-go-round that goes around and around its center.

Choice of Words: "Planets" are the big balls of rock and gas that orbit stars. "Go around and around" means to move in a circular motion. "Their own center" means the center point of each planet.

Related Expressions