What makes the subject of star formation so difficult and complex?
Answer: a. Star formation is too expensive to study in detail.
b. Clouds, fragments, protostars, stars, and nebulae all interact and influence each other.
c. Shock waves disrupt the orderly evolution of stars.
d. Stars live too long to be observed from birth to death
Which event marks the birth of a star?
Answer: a. Fusion of hydrogen atoms into helium atoms
b. Collapse of an interstellar cloud
c. Formation of a photosphere
d. Instability in an interstellar cloud
Which two ingredients are needed to make an emission nebula?
Answer: a. Interstellar gas and dust
b. Cool stars and interstellar dust
c. Hot stars and interstellar gas
d. Cool stars and interstellar gas
Tags: