Uranus was hit by a Super Earth

[kerbiloid]

And probably something really big has hit Mars.

[magnemoe]

32 minutes ago, kerbiloid said:

And probably something really big has hit Mars.

Why? we know Earth took an serious hit because of the Moon but? 
Uranus also makes sense. 

[kerbiloid]

4 minutes ago, magnemoe said:

we know Earth took an serious hit because of the Moon

We know it took a serious contact.
A hit is just a hypothesis, the contact could be a tidal destruction of a just captured proto-Moon. But badabooms attract more cash.

About Mars.
https://en.wikipedia.org/wiki/List_of_largest_craters_in_the_Solar_System
North Polar Basin (if really a crater).

[cubinator]

3 hours ago, magnemoe said:

Why? we know Earth took an serious hit because of the Moon but? 
Uranus also makes sense. 

A large impact is one leading hypothesis for why Mars' magnetic field is so messed up.

[Brotoro]

It is?