Number 126 (Story #3), April 28, 1993 by Phillip F. Schewe and Ben Stein THE EXTREME ULTRAVIOLET (EUV) waveband (10-100 nm wavelength) is one of the least studied spectral ranges in astronomy. One reason for this is that EUV is absorbed by interstellar gas, which is mostly hydrogen and helium. So it came as something of a surprise that the Rosat and the Extreme Ultraviolet Explorer (EUVE) satellite telescopes could see as far as they do. In this case EUV measurements are benefitting from the fact that our solar system seems to sit in a bubble at least partially cleared of interstellar matter, perhaps by past supernovas. This allows the telescopes to see objects (mostly hot white dwarfs) hundreds of light years away. In certain directions viewing conditions are so good that faraway galaxies can be seen. (Science News, 17 April 1993.)