What is the theme of the poem “The Falling Star” by Sara Teasdale?

The poem "Falling Star" by Sara Teasdale is a very short poem about a shooting star and its beauty. The poem describes a falling star that flies through the sky, but, because of its nature—its beauty, its burning heat, and its brightness—it can't be captured but only observed while its on its way to its destruction.
The metaphor behind this poem is the falling star is something that is so beautiful and so desirable, but this is only in its destruction. If it were not falling, it wouldn't be wished upon, and if it weren't burning itself up, it wouldn't be shining so brightly and beautifully. It is a tragic portrayal of the beauty of something that can't be attained.