Both the venerable International Ultraviolet Explorer satellite, now in its 17th year of operation, and the Extreme Ultraviolet Explorer
craft, launched in 1992, will take spectra of the plumes of material carried aloft by the Jovian explosions.
Welsh of NASA headquarters and his colleagues have used ultraviolet data from two orbiting observatories, ROSAT and the Extreme Ultraviolet Explorer
, to map the contours of a huge void in space that extends about 600 light-years across, well beyond the solar system.
Now, the Roentgen satellite (ROSAT) and the Extreme Ultraviolet Explorer
(EUVE) spacecraft have provided new details of the sun's environment.
The Extreme Ultraviolet Explorer
(EUVE), launched last June, detects this band of radiation, which can't penetrate Earth's atmosphere and is intermediate in energy between the near ultraviolet and X-rays (SN: 5/23/92, p.344).
Stuart Bowyer of the University of California, Berkeley, announced that another space-borne observatory, the recently launched Extreme Ultraviolet Explorer
, detected a quasar-like object about 2 billion light-years from Earth.