美国宇航局“卡西尼”号结束土星探索任务

meteor – n. a piece of rock or metal that burns and glows brightly in the sky as it falls from outer space into the Earth's atmosphere

solar system – n. our sun and the planets that move around it

geyser – n. a hole in the ground that shoots out hot water and steam

plume – n. something (such as smoke, steam, or water) that rises into the air in a tall, thin shape

hydro thermal – adj. of or relating to hot water —used especially of the formation of minerals by hot solutions rising from a cooling magma

vent – n. an opening through which air, steam, smoke, liquid, etc., can go into or out

contaminate – v. to make (something) dangerous, dirty, or impure by adding something harmful or undesirable to it