An article on SPACE.com with the headline Milky Way Fortified with Calcium
caught my attention. Apparently "The calcium atoms in
the hot gas emit X-rays with a specific wavelength, which can be
detected with instruments aboard ESAs XMM-Newton X-ray observatory."
That in itself is very very cool to me—astronomy using spectroscopy, though I
understand vaguely how it works, still seems a little like magic.
{ 2007 02 16 }
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