- in space; X-rays may be produced by very hot gases more than one millionºC.
- X-rays also made electrons acting together interact with a magnetic field in synchronous radiation.
- X-rays can not through our Earth’s atomsphere – astronomers can only detect the rays by using space telescopes; Chandra and XMM. (Used before ROSAT, now it switched off.)
- X-rays sources are stars and galaxies that give out X-rays. (diagram)
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