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The Invisible Sky
heftet,
1999,
Engelsk,
ISBN 9781461272229
ROSAT, the ROentgen SATellite launched in 1990, has revealed an entirely new aspect of the night sky - that of objects emitting X-rays rather than the rays of light visible to the …
Astronomie für Einsteiger
heftet,
2020,
Tysk,
ISBN 9783440168646