... Five hundred light years from Earth, in the constellation Aquarius, a sun-like star is dying. ... Is this one galaxy or two? ... The United States at Night . ... This is what the United States of America looks like at night! ... The Trifid nebula (M20) is a bright star forming region in Sagittarius, 5000 light years from Earth. In visible light, the interstellar gas cloud is crossed by dark, obscuring dust lanes which roughly divide the glowing emission nebula into three major parts. ...