Abstract
THE halo of our galaxy is a nearly spherical region containing very old stars which have a smaller content of heavy elements than our Sun. There is no detailed model for its formation. It is usually assumed that somehow a cloud of gas condensed to form our galaxy, and that the halo stars were formed during the collapse process and left with a nearly spherical distribution1. In that case, and in view of the success of the theories of nucleosynthesis in stars, it is very puzzling that the halo stars should have any heavy elements at all.
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TRURAN, J., CAMERON, A. The Galactic Halo. Nature 225, 710–711 (1970). https://doi.org/10.1038/225710a0
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DOI: https://doi.org/10.1038/225710a0
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