宇宙旅行のスリル
the thrills of space travel
宇宙旅行の時代
the era of space travel
宇宙旅行.
the space known as the universe
宇宙旅行の最新技術
宇宙旅行の技術.
the know‐how of space travel
宇宙のなぞ
the revolution of the earth round the sun
I wonder what it is like to travel through space.