Function: noun
Date: 1959
: astronomy in which celestial bodies in the solar system are studied by analyzing the return of radio waves directed at them
Function: noun
Date: 1959
: astronomy in which celestial bodies in the solar system are studied by analyzing the return of radio waves directed at them
Merriam Webster Collegiate English Dictionary. Merriam Webster - Энциклопедический словарь английского языка. 2012