How many stars are there in one group?

Answer 1

Stars are grouped by size. The groups are commonly named as: the Super Giants, Giants, Medium-size and the White dwarf. The sun belongs to the group of stars which are relatively small or the white dwarfs.

Answer 2

The detailed process by which such early galaxy formation occurred is a major open question in astronomy. Theories could be divided into two categories: top-down and bottom-up. In top-down theories (such as the Eggen-Lynden-Bell-Sandage [ELS] model), protogalaxies form in a large-scale simultaneous collapse lasting about one hundred million years. In bottom-up theories (such as the Searle-Zinn [SZ] model), small structures such as globular clusters form first, and then a number of such bodies accrete to form a larger galaxy.

Once protogalaxies began to form and contract, the first halo stars (called Population III stars) appeared within them. These were composed almost entirely of hydrogen and helium, and may have been massive. If so, these huge stars would have quickly consumed their supply of fuel and became supernovae, releasing heavy elements into the interstellar medium. This first generation of stars re-ionized the surrounding neutral hydrogen, creating expanding bubbles of space through which light could readily travel.

Answer 3

It all depends on the number of stars we are talking about:

• 1-10: A star system
• 10 -100: A blob (This is not true but should be)
• 100 - 1,000: An open cluster
• 1,000 - 100,000: A Globular Cluster.
• 100,000 - 2,000,000: A Dwarf Galaxy
• 2,000,000 - ~ A Galaxy.
• ~ A Universe.

Answer 4

The HR diagram is a graph that plots surface temperature vs. luminosity.

Answer 5

In a universe.