Luna 2 also crash land on the Moon in exactly the same way. Crash landing proved useful even after soft landing was mastered. NASA used crash landings to test whether Moon craters contained ice by crashing space probes into craters and testing the debris that got thrown out. The satellite's impact made it the first man-made object to land on another celestial body. "Luna 2" carried 5 different instruments to conduct various tests while it was on its way to the Moon. The scintillation counters would be used to measure any ionizing radiation; the Cherenkov radiation detectors would be measuring for electromagnetic
Mega Man 2 series were defined by the first game, but "Mega Man 2" added crucial conventions that were retained for the rest of the series. The traditional number of Robot Masters for the series is eight as used in "Mega Man 2", rather than the six used in the original. It was the first in the series to include an opening cinematic. "Mega Man 2" also introduced the Energy Tank item, special movement items, teleporter room, and password system, which became staples in future games. The Energy Tank became the series' iconic health refill item and later served as inspiration for a