NASA NTRS · 19720006128
The cosmic helium abundance
Abstract
Cosmic helium abundance was studied through the interior structure of young stars, profiles of helium absorption lines in the photospheric spectra of hot young stars, and emission-line spectrum of ionized gas. It is concluded that helium occurred before galaxies were formed. Inconsistencies found in the quasar spectra are briefly mentioned.
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Searle, L.. 1971-11-01. The cosmic helium abundance. https://ntrs.nasa.gov/citations/19720006128
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