When the platinum nanoparticles catch molecules from the surrounding gas and combine them with oxygen atoms from the iron - oxide surface, a surplus of iron atoms remains. (sciencedaily.com)
Another reason it takes so long is because iron atoms in the sun's interior absorb — and hold — some of the energy that passes by them. (sciencenewsforstudents.org)
X-ray observations of emission from iron atoms close to black holes may determine for the first time whether the black holes are rotating or not. (stsci.edu)