WHAT A SIGHT! Piper Truza watches a phase of a partial solar eclipse visible in Detroit on Aug. 21. Millions of Americans gazed in wonder through telescopes, cameras and disposable protective glasses as the moon blotted out the sun in the first full-blown solar eclipse to sweep the U.S. from coast to coast in nearly a century. President Barack Obama wipes away tears as he speaks at McCormick Place in Chicago on Jan. 10, 2017, giving his presidential farewell address.