Possible Clues:

• First Russian to orbit Earth
• Yuri -, first man in space
• Spaceman runs into gravitational effect a second time
• First astronaut is senile, but comes right in the end
• Vostok 1 commander
• Yuri . . . . . . . made the first manned space flight
• Yuri ......, first Russian into space
• First human in space
• Cosmonaut finding silence a feature of Saturn? Not quite
• Yuri —, first in space