Question : A star with the same color as another but 100 times brighter must be : 2147413
27) A star with the same color as another but 100 times brighter must be ________.
A) 100 times colder
B) 100 times closer
C) 100 times hotter
D) 100 times larger
E) none of the above
28) The first stars formed about 300 million years after Big Bang in the most massive nebulae because ________.
A) the massive nebulae had enough gravity to attract star material early in the history of the universe
B) it took that long for enough matter to form to make a star
C) only the massive nebulae had the material needed to make stars
D) all of the nebulae at that time were massive and it was not until much later that smaller nebulae formed
E) the massive nebulae had enough gravity to collapse and condense
29) Which of the following is not true of first generation stars?
A) They are short-lived.
B) They are composed primarily of hydrogen.
C) They are massive.
D) They have violent, explosive deaths.
E) They are very dense.
30) Prior to the formation of the protostar, ________.
A) nuclear fusion converts hydrogen to helium
B) the temperature of the cloud is greater than 10,000 K
C) the interstellar clouds are composed of equal amounts of hydrogen and helium
D) nuclear fusion does not occur
31) What is the dominant factor in the life of a star?
32) Balance for a main sequence star is achieved when ________.
A) nuclear fusion and fission occur at the same rate
B) gravitational collapse matches gas pressure
C) temperature matches the rate of nuclear fusion
D) gas pressure matches temperature
E) all of the above
33) A main-sequence star like our sun is expected to be stable for approximately ________.
A) 100 billion years
B) 10 billion years
C) 10 million years
D) 100 million years
E) 1 billion years
34) A red giant has ________.
A) a helium-rich core
B) an iron-rich core
C) no outer shell
D) a hydrogen-rich core
E) high gas pressure
35) The temperature of a red giant increases rapidly because ________.
A) friction from the collapse creates heat
B) endothermic chemical reactions occur
C) gravitational energy is converted to heat
D) exothermic chemical reactions occur
E) fusion increases and gives off heat
36) Every stage of a star's life is ruled by ________.
A) its location in the galaxy
C) the amount of dark matter it possesses