According to present scientific understanding of the Milky Way's formation, which of the following statements are true? Select al that apply. Halo stars are stars that are born in the disk and ejected into the halo by gravitational encounters. The galaxy formed from the collapse of a single, giant protogalactic cloud. Disk stars formed before halo stars. Halo stars formed before disk stars. The protogalatic cloud(s) contained essentially no elements besides hydrogen and helium

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30-11-2022
Physics

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According to present scientific understanding of the Milky Way's formation, which of the following statements are true? Select al that apply. Halo stars are stars that are born in the disk and ejected into the halo by gravitational encounters. The galaxy formed from the collapse of a single, giant protogalactic cloud. Disk stars formed before halo stars. Halo stars formed before disk stars. The protogalatic cloud(s) contained essentially no elements besides hydrogen and helium

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kumarravichandra kumarravichandra · Answer 1 · 2022-12-04T14:49:25+01:00

Halo stars formed before disk stars, The protogalactic cloud contained essentially no elements besides hydrogen and helium.

A protogalactic cloud, sometimes known as a "primeval galaxy," in physical cosmology is a cloud of gas that is developing into a galaxy. It is thought that whether a galaxy is an elliptical galaxy or spiral galaxy will depend on the pace of star formation at this stage of galactic development; a slower rate of star formation tends to produce a spiral galaxy. In a protogalaxy, the smaller gas clumps develop into stars.

It is largely agreed upon that the name "protogalaxy" itself refers to the "Progenitors of the Present Day (Normal) Galaxies, in the Early Stages of Formation." The word "early phases of formation" isn't precisely defined, though. It might be explained as "the first significant burst of star formation in a progenitor of a current elliptical galaxy"

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