Here's a neat image of Phoenix descending to the surface taken by the camera on the Mars Reconnaissance Orbiter.
Think on this, and think on it carefully: you are seeing a man-made object falling gracefully and with intent to the surface of an alien world, as seen by another man-made object already circling that world, both of them acting robotically, and both of them hundreds of million of kilometers away.
Never, ever forget: we did this. This is what we can do.