... The Cassini spacecraft, launched from Earth in 1997, has now swung past Jupiter and should arrive at Saturn in the year 2004. ... Nearly 400 years ago astronomer Johannes Kepler observed comet tails blown by a solar breeze and suggested that vessels might likewise navigate through space using appropriately fashioned sails. ... In the Center of the Lagoon Nebula . ... The center of the Lagoon Nebula is busy with the awesome spectacle of star formation. ... Will the Universe End in a Big Rip . ...