Bokeh Flower Pink Nature BeautifulColorful 163Ice AgeWallpaper Android Wall PatternFunny JapaneseGraffiti BridgeOne Tomato Food NatureNature Field Green SkyCars iPhone WallpaperPeople   476Beach Blue Nature Sea Holiday Water SkyDark Leaf Texture Nature PatternSilk Flower White Mutant NatureArt Abstract Classic Paint Illust GreenAbstract Light Dark Bubble PatternLine Art Abstract Dark Bw Smoke PatternThis artist’s impression shows how Mars may have looked about four billion years ago. The young planet Mars would have had enough water to cover its entire surface in a liquid layer about 140 metres deep, but it is more likely that the liquid would have pooled to form an ocean occupying almost half of Mars’s northern hemisphere, and in some regions reaching depths greater than 1.6 kilometres.Sunset DroneColorful 02People   222Liu Yifei Chinese Acturess Cute Star