UFO crashed into a crater on Mars?

The image taken by NASA's Mars Reconnaissance Orbiter (HIRISE) shows the northern rim of a crater in Deuteronilus on Mars.

At the northern end, we see the crater rim and ridges inside and below that rim. A channel set is entering from the west and passing through a notch in a ridge.

At the bottom of the crater we see a strange (impact?) spot and an object what looks like a flying saucer.

Is it just an optical illusion or HIRISE has captured a UFO that crashed into the crater wall?

Link Image: http://hirise.lpl.arizona.edu/ESP_044388_2160