science
Grade6
Easy
Question
Which of the following statement is correct?
- A galaxy is defined as a cloud of interstellar gas and dust at least 10 light-years across.
- A galaxy is a group of stars which contains more than 100 stars.
- Galaxy is a star, along with all of its planets and surrounding matter disks.
- The galaxy is a collection of millions, or billions of stars tied together by gravity.
Hint:
The statement which says that the galaxy is a collection of millions and billions of stars bound by gravity is correct.
The correct answer is: The galaxy is a collection of millions, or billions of stars tied together by gravity.
- The galaxy is a collection of millions and billions of stars bound by gravity.
- It is a disk made up of stars, stellar remnants, gases, dust, and dark particles.
- All the matters are bound together by gravity.
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