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

Question

Quizplus · Accepted Answer

A superbubble is a large, low-density region of interstellar space that is formed by the merger of several smaller bubbles, typically caused by the action of multiple supernovae. Inside a superbubble, hot gas and dust are pushed outwards by the combined energy of the supernovae, while cooler gas and dust is compressed towards the edges of the bubble. Superbubbles can be up to several hundred light-years in diameter, and are important drivers of galactic evolution, as they can trigger the formation of new stars and influence the distribution of gas and dust in the Milky Way.

What Is a Superbubble