U.S.R.R launches Sputnik 1
U.S.S.R launches Sputnik 3
Explorer 2 is launched, but fails to reach orbit.
Vanguard 1 is launched, and functions for 3 years.
The U.S.S.R also gets and A-bomb
The U.S. sets up the Manhattan project to create the first nuclear weapon
U.S. dropped the first H-bomb- Bikini Atoll
U.S.S.R drops an H-bomb too! 100 times more powerful than their first one. This one was also air-born.
U.S.S.R develops the ICBM (Inter- Continental Ballistic Missel)