Which term describes a cluster of stars, dust, and gas?

• A. Black Hole
• B. Galaxy
• C. Constellation
• D. Meteor Shower

Answer: (B)

A galaxy is a gravitationally bound system that contains a vast collection of stars, dust, and gas, often with dark matter making up most of its mass. This bound assembly can span tens of thousands of light-years and hosts billions to trillions of stars, all held together by gravity. The description emphasizes a large, organized collection of stellar and interstellar material, not a single object or a simple sky pattern. A black hole is an extremely dense region of spacetime with intense gravity, typically surrounded by matter, but it is not a cluster of stars, dust, and gas. A constellation is only a pattern of stars seen from Earth and does not reflect a physical grouping. A meteor shower is a temporary display caused by debris entering Earth's atmosphere, not a stable cluster in space. So the term that matches a cluster of stars, dust, and gas is a galaxy.