Meanings:
a. Naturalized U.S. citizen — an alien lawfully becoming a citizen.
b Space— an area which is free.
c. Frontiers of space—– the land that forms the furthest extent of a country.
d. Aboard — inside.
e Lift off — went up.
f. Crew —- members inside the space craft.
g. Astronaut –— a person trained to travel in a spacecraft
h. Pollinating –— to deposit pollen
i. Glued — stuck.