The Gas in the Interstellar Medium Consists of Mostly Heavy

Q6: Explain the colors of emission nebulae.

Q7: Why are dark dust clouds largely misnamed?<br>A)The

Q8: Emission nebulae like M42 occur only near

Q9: If dark nebulae are really dark, how

Q10: What does the polarization of starlight tell

Q12: What are the properties of the neutral

Q13: Which statement about the dark nebulae is

Q14: A cold region of dust which scatters

Q15: What is the primary visible color of

Q16: How can interstellar dust block starlight in