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At that time, all the planets rotated in the same direction. But something came along that changed the rotational direction of Venus and Uranus. Lets start with Venus. There are a few possibilities that we can take into account to explain why Venus rotates backwards.
Venus is initially rotating counterclockwise like the other planets and it still does. In other words, it spins in the same direction it always has, just upside down, so that looking at it from the other planets makes the spin look backward.
As I said before, there are a few explanations for this. Such strong tides could have caused the flip to happen. Another explanation comes from the cratering evidence on each planet. Soon after the planets were formed, there still were many large and small objects or maybe we can classify them as mini planets that orbited the Sun.
Well if Venus was rotating upside down then.. Most planetary axes are perpendicular to the orbital plane. This extreme tilt leads to the radical seasons that the planet experiences and makes the planet have unusual days at the poles. At the equator, Uranus experiences normal days and nights. But because it rotates on its side, at any given time one pole or the other is pointed more or less towards the Sun.
This results in one pole experiencing 42 Earth years of day followed by 42 years of night. The heavy steroid on high speed is believed to have caused the change of the paths and the rotation direction which planet Venus takes. The asteroid is believed to have hit Venus a long time ago. However, the exact time in history has not been determined yet.
Alternatively, another group of astronomers came up with an explanation that Venus initially rotated on in an anticlockwise direction just like other planets.
It thereafter slowed down and became static before it started rotating in a clockwise direction. The planet Venus. John Misachi May 16 in Environment.
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