Which Kind of Stars Are the Major Source of Energy

question 34

Multiple Choice

Which kind of stars are the major source of energy for the heating of the dust clouds and the H II emission nebulae within the planes of the Milky Way and other galaxies?

• A) Hot,young O and B stars,via their UV radiation
• B) The numerous old,red-giant K and M stars,via their IR heat radiation
• C) Very hot white dwarf stars,the remnants of planetary nebulae in the gas clouds
• D) The very many nova and supernova explosions of stars within the gas and dust clouds

---

Definitions:

Book

A set of written, printed, or blank pages fastened along one side and encased between protective covers.

Finalizers

Special methods in Java that the garbage collector calls on an object when no more references to the object exist, to perform cleanup operations before the object is destroyed.

Illegal Statements

Code elements in programming that violate the syntax rules of the programming language and prevent the code from compiling.

Static Int

A static integer variable, meaning it belongs to the class rather than instances of the class and has the same value across all instances.