VOA慢速英语:科学家研究不寻常的彗星

interstellar – adj. existing or occurring between stars

solar – adj. of or related to the sun

author – n. a writer of a book or report

refer – v. to note or suggest

composition – n. the way in which something is put together or arranged

amateur – n. a person who does something (such as a sport or hobby) for pleasure and not as a job