Falling Angel (1) - Sol 67

Caption NASA originale:"Observing the sky with the green filter of its PanCam, the Mars Exploration Rover Spirit came across a surprise: a streak across the sky.
The streak, seen in the middle of this mosaic of images taken by the NavCam and the PanCam, was probably the brightest object in the sky at the time. Scientists theorize that the mystery line could be either a meteorite or one of seven out-of-commission spacecraft still orbiting Mars.
Because the object appeared to move 4° of an arc in 15 seconds it is probably not the Russian probes Mars 2, Mars 3, Mars 5 or Phobos 2; or the American probes Mariner 9 or Viking 1".