Been looking at
this picture of Mars, and eating ham sandwiches, so here's what I came up with:
That big trench is where a tan meteor plowed into Mars, creating an Extinction Level Event to a normally dark colored world. The craters indicate that it happened a long time ago--say a bajillion years? K, so I've never really believed there's such a thing as a 'stable' orbit. Things go sailing off, or they fall back down. And all the planets are basically burped out by the Sun every so often. So...a bajillion years ago Mars was where Earth is today, and had a thriving civilization on it. And in another bajillion, it will be Venus' turn. We should send archeology excavator robots to Mars.
So um, guess I'm just saying, don't eat ham sandwiches after midnight.