One of the most exciting demonstrations at Sun Microsystems' JavaOne conference was given by Jeff Johnson, the graphical user interface head of the National Aeronautics and Space Administration's (Nasa) Hubble Space Telescope at the Goddard Space Flight Centre in Maryland. Mr Johnson's team manages the flow of data for users and scheduling of repairs to the telescope. Mr Johnson and his team were among the first to use Java when it was put on the Internet in 1995. The team employs Java to control the telescope. Mr Johnson said Java had ended the logistical nightmare of different teams at the Nasa control centre using different platforms and gave them faster access to data. In the live demonstration, data written in Java streaming down from the Hubble spacecraft appeared on the screen of an ordinary PC. Mr Johnson said the system his team devised was the most successful Nasa had implemented. 'Nasa will never do it another way. With Java we have a proven technology,' he said. While upgrades to be made to the telescope's on-board computer beyond 1999 had yet to be decided, Mr Johnson said they would be written in Java.