... Water Ice Imaged in Martian Polar Cap . ... On another Valentine's Day (February 14, 1990), cruising four billion miles from the Sun, the Voyager 1 spacecraft looked back to make this first ever family portrait of our Solar System. ... The Nebula's glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud only 1500 light-years away. ... The dust not only absorbs light, but also reflects the light of several bright blue stars that formed recently in the nebula. ...