ocr: X-RAYS X-rays are electromagnetic radiation with wavelengths between 0.1 and 100 A angstrôm). All stars emit X-rays, but double stars, whose elements are very close to one another, emit the most. X-rays are extremely harmtul to earthlike life, but luckily our outer atmosphere absorbs all of it. One nm nanometre) equals 10. - A (angstrôm) = 10-10 metres. X-rays were discovered by Ger- man physicist William Koentgen (1845 - 1923). While experi- ment in with cathode-ray tubes, his lampshade began to shine with fuorescent light, even though the radiafion source was covered with black paper. The li ...
