SpaceWhy we must investigate Phobos, the solar system's strangest object Mars's moon Phobos is so strange that no one knows how it formed. But a forthcoming mission could solve this mystery - and a host of other puzzles connected to the solar system's deep past Features
SpaceDistant dwarf planet Makemake might have a surprising ice volcano A small world in the outer solar system appears to have volcanic activity possibly spurred by liquid water 51¶¯Âþ