Earth vs. Mars: The Two Planets Weigh In Mars is the most Earth-like other world known, and with the two planets on the verge of their closest approach in recorded history (Aug. 27), it's time for the planets to weigh in. In this tale of the tape, we present the most pertinent and interesting facts that compare and contrast the two very different worlds.         Earth         Mars Diameter         About 7,926 miles (12,756 kilometers) but growing, at least at the …showed first 75 words of 616 total…

…showed last 75 words of 616 total…of ice at the south pole. Dry ice         Sure. 4,200 pounds of it is used weekly in just one Vegas show.         Tons, covering the water ice at the south pole. Water         Inundates the place, especially in basements and during picnics.         Not a drop that we know of for sure -- yet. But possibly a lot long ago and maybe some today, under the surface. Best photo         The Blue Marble. Couldn't decide, so we had experts pick 10.