Bright Ceres Crater Looks Like a Stop Sign (Photos)

A strange crater on Ceres seems to be warning spacecraft not to land on the dwarf planet's battered surface. The rim of Ceres' Haulani Crater is composed of relatively straight lines, making the 21-mile-wide (34 kilometers) feature look oddly like a stop sign, as several dazzling new photos captured by NASA's Dawn probe show. "The crater's polygonal nature (meaning it resembles a shape made of straight lines) is noteworthy because most craters seen on other planetary bodies, including Earth, are