Mars' moon Phobos may actually be a comet — or at least part of one — that was gravitationally captured by the Red Planet long ago, a new preprint study based on previously unpublished photos ...

This schematic representation illustrates the change of the phase angle over the course of the animation – caused by the movement of the observer. Animation of the Martian moon Phobos with phase angle ...

If you buy through a BGR link, we may earn an affiliate commission, helping support our expert product labs. With groups like NASA and the European Space Agency focusing largely on missions to ...