Dark nebulae are extreme examples of
A) interstellar extinction.
B) interstellar reddening.
C) emission nebulae.
D) polycyclic aromatic hydrocarbons (PAHs) .
Correct Answer:
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Q49: The distinctive color of a reflection nebula
Q50: The group of stars that is formed
Q51: The distinct blue color of the nebulosity
Q52: What condition is considered sufficient for an
Q53: The Horsehead Nebula in Orion (see Figure
Q55: How do massive stars normally end their
Q56: The MOST likely places in which stars
Q57: In photographs, the Pleiades open star cluster
Q58: Which of these statements about open star
Q59: New stars are formed from
A) hot supernova
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