184 Pounds Satellite Launched in 1957: __ I
Puzzle 3 of Sailing Hard Pack
Question is: 184 Pounds Satellite Launched in 1957: __ I
and the answer is: SPUTNIK
Word Meaning:
SPUTNIK — (historical) Any of a series of Soviet robotic space satellites, especially the first one in 1957.
Definitions from Wiktionary.