The true statements about the understanding of the Milky Way's formation, includes:
(1) The protogalatic clouds contained essentially no elements besides hydrogen and helium.
(2) Halo stars formed before disk stars
The Milky Way is described as the galaxy that includes our Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the nak-ed eye.
In a more broader sense, a protogalactic cloud collapses so that its gas collects into a spinning disk. Halo stars are those born before the gas formed a disk, and disk stars can form only after the formation of the disk.
The picture described to be more complex because evidence indicates that there were several distinct protogalactic clouds that merged to become our galaxy.
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