What is the key factor that determines the temperature, density, radius, luminosity, and pace of evolution of a protostellar object?
A) composition of the nebula
B) rotation of the nebula
C) mass of the nebula
D) temperature of the nebula
E) magnetism of the nebula
Question 2On its way to Jupiter, Galileo also gave us close-ups of:
A) Mars and Venus.
B) Ceres and Vesta.
C) Gaspra and Ida.
D) Mathilde and Eros.
E) Mercury and Venus.
Question 3What is the Oort cloud?
A) It is the spherical distribution of the trillion or so comets thought to orbit the Sun at great distances.
B) It is another name for the cloud of gas from which our solar system was born.
C) It is a great cloud of gas that resides far beyond the orbit of Pluto.
D) It is a giant storm in the atmosphere of Saturn.
Question 4To have a negative ion, you must have:
A) taken away a proton from the nucleus.
B) added a positron to the nucleus.
C) added a positron to the outer electron shell.
D) added an electron to the outer electron shell.
E) None of these; only positive ions can exist in nature.
Question 5The ________ epoch has dominated the last ten billion years of universal evolution.
Fill in the blank(s) with correct word
Question 6What happens to the surface temperature and luminosity when a protostar undergoes convective contraction?
A) Its surface temperature and luminosity increase.
B) Its surface temperature remains the same and its luminosity decreases.
C) Its surface temperature and luminosity decrease.
D) Its surface temperature decreases and its luminosity increases.
E) Its surface temperature and luminosity remain the same.
Question 7How long is a day on Mars?
A) 243 Earth days
B) about 4.2 Earth days
C) 24 hours, 36 minutes
D) 23 hours, 56 minutes
E) 9 hours, 55 minutes