A speaker lies back, or simply stands, beneath a sky full of stars and takes in the whole sweep of the universe. The poem is short, only four lines, and its main move comes at the very end. We might expect someone staring into space to start wondering about the big mysteries: how far it all goes, what is out there, what it means. The speaker says no to that. They "do not ponder the unknown," and instead settle on something simpler: the beauty of what they see.
That small turn gives the poem its feeling. The mood is calm and quiet, almost relaxed. There's no anxiety about how huge the cosmos is, and no urge to solve anything. The speaker seems content just to look and appreciate. The last line is abrupt, which makes it feel like a gentle breath out, a moment where thinking stops and simply seeing takes over.