A powerful poem of personal loss. I am curious why you chose the other sun to be 35 times greater than our own, but I enjoyed the great way you put its explosion and demise as a green spot on the astronomer's retina, but no-one to tell, except us, your readers.
Some very powerful imagery here, but I'm not sure about the last four lines. You go from the astronomer's retina to the great open dome of your heart. Kind of unclear. 'with no one to tell' is a good line.
Ted Kooser is neither inexperienced, nor without talent, as Mr. Muhammad suggests. He has been the U.S. Poet Laureate for the past two years, won this year's Pulitzer, and has won the Pushcart prize and 2 National Endowment for the Arts Fellowships. After 30 more years of writing poetry, should he still be alive, I would think he would be standing in Stockholm accepting his Nobel Prize.