Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
asteroid – n. any one of thousands of small planets that circle around the sun
mission – n. a flight by an aircraft or spacecraft to perform a specific task
charcoal – n. a hard black material that is made by burning wood with a small amount of air
impactor – n. an object (such as a meteorite) that collides with another body
bedrock – n. the solid rock that lies under the surface of the ground
compartment – n. an enclosed space or area that is usually part of something larger and is often used to hold a specific thing
meteorite – n. a piece of rock or metal that has fallen to the ground from outer space : a meteor that reaches the surface of the Earth without burning up entirely
