This element's forbidden spectral lines include 496 and 501 nanometers. Isotope ratios of this element
 distinguish K and R meterorites and identical isotope ratios of it are important evidence for the Giant
 Impact Hypothesis. Studies by the HST have shown that the trace atmosphere of Ganymede is composed of
 compounds of this element. A defining characteristic of carbon stars is that they have more carbon than this
 element. The burning process of this in stars creates silicon. The Bethe-Weizsäcker-cycle uses this element
 as a catalyst along with nitrogen and carbon
This element's forbidden spectral lines include 496 and 501 nanometers. Isotope ratios of this element
 distinguish K and R meterorites and identical isotope ratios of it are important evidence for the Giant
 Impact Hypothesis. Studies by the HST have shown that the trace atmosphere of Ganymede is composed of
 compounds of this element. A defining characteristic of carbon stars is that they have more carbon than this
 element. The burning process of this in stars creates silicon. The Bethe-Weizsäcker-cycle uses this element
 as a catalyst along with nitrogen and carbon. For 10 points, name this element whose diatom form is the
 second most abundant gas in Earth's atmosphere.
This element's forbidden spectral lines include 496 and 501 nanometers.
{oxygen}