Newly released images of Mars reveal a "smiley" salt deposit on the Red Planet's surface. A related study suggests that similar deposits, which were left behind from ancient lakes, may be a good place to look for signs of former life on Mars.
Scientists spot ancient 'smiley face' on Mars — and it could contain signs of life : Read more
Scientists spot ancient 'smiley face' on Mars — and it could contain signs of life : Read more