What Is a Superbubble

question 53

Multiple Choice

What is a superbubble?

• A)a very low-density region of interstellar space,formed by the merger of several bubbles
• B)a very high-density region of interstellar space,filled with gas ejected from nearby star systems
• C)a bubble so large that it fills much of the galactic halo
• D)the region of space cleared by a powerful supernova
• E)a cloud of gas that can form a million or more stars

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