REELS WORLD USA 🇺🇸 on Instagram: "Black holes are among the most mysterious and extreme phenomena in the universe. They are regions of space where gravity is so incredibly strong that nothing, not even light, can escape once it gets too close. Most black holes are formed when very massive stars reach the end of their life cycles, run out of nuclear fuel, and collapse inward under their own gravity. During this collapse, an enormous amount of mass is compressed into an extremely small volume, c