You observe a star cluster with a main-sequence turn-off point at spectral type G2 (the same spectral type as the Sun). What is the age of this star cluster?
A) 4.6 billion years
B) 10 billion years
C) 10,000 years
D) 100 billion years
E) You also need to know the luminosity class of the turn-off point to determine the age.
B
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Hydrostatic equilibrium in our Sun is the balance between:
A) convection and radiation. B) convection and gravitation. C) pressure and radiation. D) radiation and gravitation. E) gravitation and pressure.
What is the Big Bang theory?
A) the idea that the universe as we see it formed when two massive galaxies collided together B) the idea that all matter and energy in the universe began in an unimaginably dense state, and then space itself began expanding C) the idea that the galaxy formed from the supernova explosion of a massive star
Consider the following controls in an automobile: gas pedal, brake, steering wheel. The controls in this list that cause an acceleration of the car are
1.all three controls. 2.the gas pedal and the brake. 3.only the brake. 4.only the gas pedal.