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Simply by looking at the planet itself. If it's spinning, then it rotates.
What else can I help you with?
Do all planets except earth rotate?
All planets rotate. Even earth.
Which planets rotate on an axis?
All of the planets in the Universe rotate on an axis. They all do.
Do all planets revolve and rotate?
Yes, all the planets in our solar system revolve and rotate.
Which planets rotate from east to west?
Viewing from their north poles all planets rotates from west to eat (clockwise). Except the planets Venus and Uranus. The rotational acceleration(speed) varies from planets to planet
What planets don't rotate?
All of the planets in the solar system rotate, but two are very slow. They are Mercury and Venus.
Does Saturn rotate on its axis?
Yes. All planets rotate about an axis.
What is the directions the planets rotate around the sun?
Viewing in space, the north poles of the Sun and planets, they all orbit the Sun in a east to west direction. However, their orbital acceleration (speed) varies from planet to planet. e.g. Earth ; 1 year, Mercury ; 66 Earth Days. Jupiter ; 11 Earth years et.seq.,
What planets go round the stars?
All 8 planets in our solar system rotate around a star, our sun. Virtually all planets rotate around a star.
What does the earth do to other planets?
rotate
How many planets rotate clockwisegive the names?
Within the nine old planets, 3 of them have retrograde rotation: rotate clockwise (westward). They are Venus, Uranus and Pluto. Mercury, Earth, Mars, Jupiter, Saturn and Neptune have direct rotation: rotate anti-clockwise (eastward). All the nine planets revolve around the sun eastward or anti clockwise.
Do other planets rotate?
Yes, some faster than others. In fact, virtually all spacial bodies rotate.
Is all planets rotate around its axis?
no
