Abstract
Observations obtained with the recently refurbished Hubble Space Telescope reveal strong absorption arising from singly ionized helium along the line of sight to a high-redshift quasar. The strength of the absorption suggests that it may arise in a diffuse ionized intergalactic medium. The detection also confirms that substantial amounts of helium existed in the early Universe, as predicted by Big Bang nucleosynthesis theory.
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Jakobsen, P., Boksenberg, A., Deharveng, J. et al. Detection of intergalactic ionized helium absorption in a high-redshift quasar. Nature 370, 35–39 (1994). https://doi.org/10.1038/370035a0
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DOI: https://doi.org/10.1038/370035a0
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