The temperature of the layer of gas that produces the visible light of the Sun is
A) 3,500 K
B) 5,800 K
C) 12,300 K
D) 300,000 K
E) 15 million K
B
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The dark age is a period lasting hundreds of millions of years until the formation of the first stars
Indicate whether the statement is true or false
The graph below plots the escape velocity of several solar system objects along the vertical axis and the surface temperature along the horizontal. The lines plotted in the figure are the fastest speeds of gas particles as a function of temperature for various gases. Which of the gases plotted in this diagram could be retained by Miranda?
a.
only CO2
b.
only NH3
c.
CO2, NH3, and O2
d.
all of them
e.
none of them
Two ways in which the starting conditions in a protogalactic cloud might cause it to become an elliptical (rather than spiral) galaxy are if the cloud begins with either
A) relatively little angular momentum or relatively high density. B) relatively high angular momentum or relatively low density. C) relatively high mass and a relatively low abundance of heavy elements. D) relatively low mass and a relatively high abundance of heavy elements.
Which of the following is a scalar quantity?
A) velocity B) acceleration C) displacement D) mass E) force