Answer: I'm sorry but this is rather difficult to answer considering that we don't have your class, if you could specify what you have been learning or even if have a basic overall segment or module to share it would make it far easier and feasible to answer, thank you very much
Explanation: I need to know what you have been learning to help you cheat, especially in english.
Answer:
American astronomer and radio engineer who built the first radio telescope and was largely responsible for the early development of radio astronomy, which opened an entirely new research front in the study of the universe.
Obsolete, superfluous, redundant are fairly near
