... The Cat's Eye Nebula (Revisited) . ... Within the last few years, observational astronomy has given humanity evidence of the existence of worlds beyond the solar system. ... Launched in the early 1970s Pioneer 10 and 11 were appropriately named - becoming the first spacecraft to travel through the asteroid belt, first to fly by Jupiter and Saturn, and the first human artifacts to venture beyond the solar system. ... NASA's robot spacecraft Galileo began its long voyage to Jupiter in October of 1989....