Through the process of fusion that gives stars their luminousity, lighter elements like Helium are constantly being turned into heavier elements. A metal rich star is a star whose abundance of such heavier elements is roughly comparable to that of the Sun. Metal poor stars on the other hand have more Helium than the Sun. Solar Mass Solar mass is a unit of measurement commonly used when discussing the masses of stars and galaxies. The Andromeda Galaxy, identified as M31, NGC 224, is a galaxy close to the Milky Way.
Dwarf galaxies contain so few stars that an observer can see right through their center.
Top of Article Middle of Article Top of Page Questions 1. The first question I encountered during the web page project involved the nature of how stars convert lighter elements like hydrogen to heavier elements like helium and even heavier metallic elements. I turned to Universe 5th edition, where I learned that different stars are in different categories according to where in their interior thermonuclear reactions that turn hydrogen into helium and so on occur, and that that the nature of these reactions also has a relationship to how old the star is. The older the star is, the less hydrogen being converted to helium, and thus the lower the temperature. My second question had to do with the enigmatic nature of the high-velocity cloud in relationship to other galactic objects.