1. Sputnik I

--world's first artificial satellite

--Soviet

--launched October 1957

--began the space race

--Sputnik II (Nov) carried dog

2. Explorer I

--January 1958

--first American satellite

3. Yuri Gagarin

--April 1961

--first human (Soviet) in space

4. Alan Shepard

--May 1961

--first American in space

5. John Glenn

--Feb. 1962

--first American to orbit Earth

--Mercury 6

6. Mariner 2 and 4

--space probe to Venus and Mars

7. Apollo program

--explore and land on the moon

8. Skylab

--first U.S. space station

--1973

9. Voyager 1 & 2

--space probe to Jupiter, Saturn,