Why do Venous and Uranus rotate from east to west, but other planets rotate from West to east?
Answers
Answer:
Venus spins on its axis from east to west, while Uranus is tilted so far over, it's virtually spinning on its side. Every other planet, including our own, spins from west to east, and scientists haven't figured out why.
The planets should really all be spinning the same way: our Solar System was formed by a collapsing and rotating cloud of gas, and it's thought that the spin direction of most planets (like Earth) has been carried over from that ancient rotation.
But Venus and Uranus are the exceptions: they have what's known as retrograde rotation, spinning counter to the rotation of the Sun. But how is this possible?
One of the most long-standing hypotheses is that Venus and Uranus originally rotated counter-clockwise – like Earth and the other planets still do – but were struck at some point by massive objects (perhaps other planets) that sent them spinning in different directions.
In recent years, astronomers have looked for other explanations, examining Venus and Uranus independently.
In 2011, simulations suggested that a number of smaller collisions, rather than one big impact, knocked Uranus' spin to an angle of 98 degrees. This could also explain why the planet's moons rotate at the same angle – something that would be unlikely if there were just one massive hit.
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