You may have never seen a large plane like this one. It’s made by a company called Stratolaunch. It weighs almost 230 tons (吨) and can carry 250 tons of things. It has two cockpits (驾驶舱), six engines (发动机) and 28 wheels (轮子). It has a wingspan (翼展) of 117 meters, longer than most soccer fields.