... Iridescent clouds . ... A relatively rare phenomenon known as iridescent clouds can show unusual colors vividly or a whole spectrum of colors simultaneously. ... The Cassini spacecraft, launched from Earth in 1997, has now swung past Jupiter and should arrive at Saturn in the year 2004. ... In the Center of the Lagoon Nebula . ... The center of the Lagoon Nebula is busy with the awesome spectacle of star formation. ... In this nebula is a bright star cluster known as the Trapezium, shown above. ...