Mysterious "halos" of rock surrounding cracks in a Martian crater may be made of water-rich opal gemstones, a new study suggests.
Mars crater is 'chock-full' of opal gemstones, hinting at widespread water and possible microbial life : Read more
Mars crater is 'chock-full' of opal gemstones, hinting at widespread water and possible microbial life : Read more