3. What American scientist launched the first gasoline-fueled rocket?
When was it launched?
4. What country launched Sputnik 1 in 1957 to measure the density and
temperature of the upper atmosphere?
5. What country launched Explorer 1 in 1958?
6. Who was the first person to travel in space? When? What country was
he from?
7. Who took the first spacewalk and when was it taken?
8. Who was the first U.S. astronaut to walk in space?
9. What three U.S. astronauts were killed in the 1967 fire that swept
through Apollo 1 as it
sat on the launch pad?
appearing earlier in this work