i was thinking, couldn't they afford to put a simple signaling mirror or corner cube reflector on the lander so rosetta can just scan the surface and see any re

i was thinking, couldn't they afford to put a simple signaling mirror or corner cube reflector on the lander so rosetta can just scan the surface and see any reflection? they've had them on the moon for decades. http://en.wikipedia.org/wiki/Corner_reflector http://en.wikipedia.org/wiki/Corner_reflector