DIANE THIEL’S WORK has always asked fundamental and human questions. Janet Holmes, reviewing Thiel’s first book, Echolocations, notes that Thiel’s work deals with “silences, evasions, loss, and omissions.” This third poetry book, Questions from Outer Space, still revolves around the unseen and silent, but differently-with a larger lens, an even greater range of form and voice, and a mature grace.