Uranus rotates pretty wierd, it's 90-degrees tilted; Why is Uranus's axis of rotation tilted?
The best answer for this is;
that at a distant point in its past, Uranus was struck by a very large object, which knocked it to its side, and current tilt.
Imagine if you took a top, and smacked it with a rock. The top might be turning perfectly alright at first, but after it had been hit, the top would most likely be wobbling significantly. Similarly, after an impact, a planet tends to wobble, and it would even more if the impact occurred from a certain axis.
Ok, so my Question is; Is such a collision even physically possible without simultaneously causing the Planet to fly away from its orbit?
The Axial-Rotation Energy of Uranus is 1.11 x 10^32 J
R= 25 000 km, m= 8.683 x 10^25, Rotation time 62064 Seconds. ,, just to scale; this is 432 x times the one of Earth.
About the Meteorite impact; Calculated with the info provided by this link, we need a following metheorite size;
Mass 7.698 x 10^23 kg, More than Mars.
Volume 2.96 x 20^20 m3
- Radius; 8 270 km; bigger Than Mars.
I don't quite believe this. What about multiple collisions? According to the link for Meteoric impacts a 1000 m diameter Meteorite might collide every 440 000 Years. Such an Meteorite has an energy of 2 x 10^20 J. So we need only 556198778270 pcs of these, and it would take some 244 727 462 438 800 000 Years.
I don't quite believe this either. I rather believe that I have calculated here something wrong. Or there must be some other explanation.
This Question is combined with this one; Earth's Kinetic energy change
A question from Mercury's rotation might still follow.