A ‘smiley face’ has been discovered on Mars- and scientists sat it could contain traces of extraterrestrial life. The face, composed of two circles and a line inside a circle, can only be seen under ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: ESA/TGO/CaSSIS Astronomers recently spotted a surprising "smiley face" beaming up from ...