Which statement describes black holes?

• A. Region of space where light cannot escape due to very strong gravitational forces.
• B. They emit strong visible light in all wavelengths.
• C. They are always found only in dwarf galaxies.
• D. They are luminous like stars.

Answer: (A)

Black holes are regions of space where light cannot escape because gravity is extremely strong, pulling photons back so they cannot break free. This means a boundary called the event horizon forms, marking the point beyond which nothing can escape. Because they don’t emit light themselves, black holes appear invisible; we detect them by indirect clues like X-rays from hot matter in an accretion disk, or by the gravitational effects on nearby objects and by gravitational waves from mergers. The statement describing a region of space where light cannot escape due to very strong gravitational forces is the best answer. Other descriptions—emitting strong visible light, being found only in dwarf galaxies, or being luminous like stars—don’t match what black holes actually are.