What term describes the broad collection of stars bound by gravity that includes our galaxy?

What term describes the broad collection of stars bound by gravity that includes our galaxy?

• A. Universe
• B. Milky Way
• C. Solar System
• D. Galaxy

Answer: (D)

A galaxy is a gravitationally bound system containing stars, gas, dust, and dark matter. That makes it the broad category that describes large collections of stars bound together by gravity, and our own Milky Way is one example of such a galaxy. The Solar System is just the Sun and its planets, far too small to be a galaxy, and the Universe is everything—space, time, matter and energy in all forms—so it’s broader than a single bound collection of stars. Since the question points to the general class that includes our galaxy, the term that fits best is Galaxy.

A galaxy is a gravitationally bound system containing stars, gas, dust, and dark matter. That makes it the broad category that describes large collections of stars bound together by gravity, and our own Milky Way is one example of such a galaxy. The Solar System is just the Sun and its planets, far too small to be a galaxy, and the Universe is everything—space, time, matter and energy in all forms—so it’s broader than a single bound collection of stars. Since the question points to the general class that includes our galaxy, the term that fits best is Galaxy.