(N) :
(short for Röntgensatellit; in German X-rays are called Röntgenstrahlen, in honour of Wilhelm Röntgen) a German Aerospace Center-led satellite X-ray telescope, with instruments built by West Germany, the United Kingdom and the United States.
(N) :
(short for Röntgensatellit; in German X-rays are called Röntgenstrahlen, in honour of Wilhelm Röntgen) a German Aerospace Center-led satellite X-ray telescope, with instruments built by West Germany, the United Kingdom and the United States.