Ontario Grade 9 Science Practice Exam 2025 – Complete Study Resource

A black hole is a region in space where gravity is extremely strong due to the concentration of matter in a small space. This causes the region to have such a strong gravitational pull that even light cannot escape, hence the term "black hole".

Option B is incorrect because black holes do not form new galaxies, they can only be found within existing galaxies.

Option C is incorrect because while the concept of a black hole may lead to speculation about the end of the universe, it is not the definitive end.

Option D is incorrect because, while the collapse of a large star may lead to the creation of a black hole, it is not the only means by which a black hole can form.