or potential energy stored in an object’s mass B) the radiative energy carried by light C) the electric charge of the object D) the kinetic energy of a moving object E) the gravitational potential energy of an object held above the ground The following questions refer to the sketch below of an H-R diagram for a star cluster. Figure 17. 2 Final 88) Based on its main-sequence turnoff point

or potential energy stored in an object’s mass B) the radiative energy carried by light C) the electric charge of the object D) the kinetic energy of a moving object E) the gravitational potential energy of an object held above the ground The following questions refer to the sketch below of an H-R diagram for a star cluster. Figure 17. 2 Final 88) Based on its main-sequence turnoff point. the age of this cluster is A) about 10 billion years. B) less than 1 billion years. C) more than 15 billion years. D) about 2 billion years. E) about 1 billion years. 9) What percentage of a molecular cloud’s mass is interstellar dust? A) 1% B) 28% C) 50% D) 12% E) 1-50%

or potential energy stored in an object’s mass B) the radiative energy carried by light C) the electric charge of the object D) the kinetic energy of a moving object E) the gravitational potential energy of an object held above the ground The following questions refer to the sketch below of an H-R diagram for a star cluster. Figure 17. 2 Final 88) Based on its main-sequence turnoff point