However, in the early Universe, almost all of the stars were O or B-class stars, with an average mass 25 times greater than average stars today. Population II stars in the outer galactic halo and in globular clusters have much lower abundances of the heavy elements—often less than one-hundredth the concentrations found in the Sun and in rare cases even lower.

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The rougly spherical region of faint old stars and globular clusters in which the rest of the galaxy is embedded is called the galactic _____. Another naming convention, drawing upon a star's metal content, lists stars as belonging to Population I, Population II and so on. Many Population III stars were probably more massive than even the Pistol Star, which may have already ejected half of its initial 200 Solar-masses since its birth as much as three million years ago.

... up to 300 times the mass of the Sun.

The star Schlaufman and his …

The best evidence for a distinct population of stars would be a lower cutoff in the metallicity distribution of Population II stars.

Population II stars are lower in metals than population I stars. The formation of the Sun may have been triggered by shockwaves from one or more nearby supernovae.

How are population II stars different than the sun, a population I star? They have circular orbits and metal abundances of 1 to 2.5 times solar abundance.

The Sun is a Population I, or heavy-element-rich, star. Population I stars include the sun and tend to be luminous, hot and young, concentrated in the disks of …

Young, metal-heavy stars like the sun are Population I stars; the older the star, the higher the population number. When astronomers classify stars, they normally lump them into three categories, creatively named Population I, II, and III stars. Which of the following are problems facing the traditional hypothesis of the formation of the Milky Way? Early stars born in the range of 140 to 260 Solar-masses may … Population I stars are stars like our Sun…

The oldest population II star discovered to date has less than one ten-millionth as much iron as the Sun, for example. Yet as studies of the universe continue, astronomers refine their categorization of its stars. Representative objects include H I and molecular clouds, H II regions, protostars, stars of types O & B, supergiants and classical cepheids. Wikimedia Commons user … What is the phase of the moon 4 days before the new moon? Stars less than 100 million years old are found in the spiral arms within 400 light years of the disk plane.

Population II stars have lower metal abundances than the Sun.

The rotational velocity of a star near the Galaxy's outer edge and the distance to that star.

... How are population II stars different than the Sun?

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