ray ▁source ▁found ▁in ▁the ▁const ell ation ▁Sc or pi us ), ▁the ▁X - ray ▁emission ▁of ▁Sc or pi us ▁X - 1 ▁is ▁ 1 0 , 0 0 0 ▁times ▁greater ▁than ▁its ▁visual ▁emission , ▁whereas ▁that ▁of ▁the ▁Sun ▁is ▁about ▁a ▁million ▁times ▁less . ▁In ▁addition , ▁the ▁energy ▁output ▁in ▁X - ray s ▁is ▁ 1 0 0 , 0 0 0 ▁times ▁greater ▁than ▁the ▁total ▁emission ▁of ▁the ▁Sun ▁in ▁all ▁w avel ength s . ▁ ▁Many ▁thousands ▁of ▁X - ray ▁sources ▁have ▁since ▁been ▁discovered . ▁In ▁addition , ▁the ▁space ▁between ▁galaxies ▁in ▁galax y ▁clusters ▁is ▁filled ▁with ▁a ▁very ▁hot , ▁but ▁very ▁dil ute ▁gas ▁at ▁a ▁temperature ▁between ▁ 1 0 0 ▁and ▁ 1 0 0 0 ▁meg ak el v ins ▁( M K ). ▁The ▁total ▁amount ▁of ▁hot ▁gas ▁is ▁five ▁to ▁ten ▁times ▁the ▁total ▁mass ▁in ▁the ▁visible ▁galaxies . ▁ ▁S ounding ▁ro cket ▁fl ights ▁ ▁The ▁first ▁sound ing ▁ro cket ▁fl ights ▁for ▁X - ray ▁research ▁were ▁accomplished ▁at ▁the ▁White ▁S ands ▁Miss ile ▁Range ▁in ▁New ▁Mexico ▁with ▁a ▁V - 2 ▁ro cket ▁on ▁January ▁ 2 8 , ▁ 1 9 4 9 . ▁A ▁det ector ▁was ▁placed ▁in ▁the ▁nose ▁cone ▁section ▁and ▁the ▁ro cket ▁was ▁launched ▁in ▁a ▁sub orb ital ▁flight ▁to ▁an ▁alt itude ▁just ▁above ▁the ▁atmosphere . ▁ ▁X