X-rays Definition and 103 Threads

How can we see the x-ray emission from the center of our galaxy? I thought that the intersteller dust extinguished practically all of the visible light from that direction, which is why we can't "see" the bulge. How then, can even shorter wavelength photons manage to get through? I thought...

http://www.newscientist.com/news/news.jsp?id=ns99994927" It seems that the organs that could be affected are the hypothalamus, the pituitary and the thyroid gland. Although it is ofcourse possible that requiring an X-ray itself might be the riskfactor.. The dental records of total 4500 women...

Is there a formula to work out the energy associated with x-rays when i have a frequency and wavelength?