Test bomb underwater/ground

Truman approves first H-bomb

Travel 6,000 miles accurately within its target

First atomic bomb by soviet union

Stalin dies

Treaty between UK, USSR, and USA to limit nuclear testing.

Explorer 1 launched to orbit

NASA was formed

Pioneer 1 launched and reached heights if 70,700 miles.

Discoverer XIV launched and first satelite in space.

First American spacewalk was in space for 23 minutes.

Sputnik 1 launched

Sputnik 3 is launched

First Russian in space became a soviet hero

First Russian Woman in space was chosen to fly out of 400 other women.