Bright Object Descends on Mars

At first glance, this appears to be a Martian moon–until it is photographed in front of a distant mountain range, still glowing strongly. Unless there is a better explanation (and a believable one) coming from NASA, this is a genuine unknown, and on Mars! (The original of this video was hacked and destroyed, but another version is now available on YouTube. Your Out There editor would suggest downloading it promptly if you wish to retain access to it.)