When I awoke
a brand new planet
Had been given a name -
this Home I'm in,
The abrupt opening conveys the narrator’s thought, as if speaking to an unseen listener. The technique, that of a  dramatic monologue . This serves as a hook to capture the interest of the reader. 
 When I awoke  could imply, literally, his awakening to the news that the planet had been named, or could be a  metaphor  for the day of his birth.
Pluto