An interstellar gas cloud has a temperature of 100 K and a density of 50 particles per cubic centimeter.How could an astronomer most easily observe this cloud?
A) atomic hydrogen absorption lines
B) molecular absorption lines
C) atomic hydrogen emission lines
D) molecular emission lines
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Q2: Which of the following lists the phases
Q3: Giant molecular clouds are typically:
A) spherical.
B) hierarchical,
Q4: Which of the following adjectives best describes
Q5: Which of the following is an important
Q6: What is the wavelength of radiation produced
Q8: A gas cloud is in pressure equilibrium
Q9: How do dust particles affect the formation
Q10: How are the properties of the densest
Q11: An interstellar gas cloud with a density
Q12: Which part of the interstellar medium is
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