Old Star, New Trick: Astronomers Have Detected Arsenic And Selenium In Ancient Star For First Time

For the first time, astronomers have detected the presence of arsenic and selenium, neighboring elements near the middle of the periodic table, in an ancient star in the faint stellar halo that surrounds the Milky Way. Arsenic and selenium are elements at the transition from light to heavy element production, and have not been found in old stars until now.

Keywords:  presence   middle   faint   table   neighboring   periodic   element   surrounds   halo   transition   light   heavy   stellar   production   stars   
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