Explain · analogy
What a black hole is in terms of the bottom of a school bag
A black hole is simply the bottom of a school bag, where the pull of gravity is so absolute that not even a fluorescent highlighter can escape once it crosses the event horizon of your maths homework.
Much like a collapsing star that runs out of fuel, the school bag starts with immense density, typically formed by cramming three textbooks, a damp PE kit and a singular crusty apple into a space designed for a laptop. Once these items tumble past the zip-seam, they are lost to the crush of space-time, effectively vanishing from the observable universe of your bedroom floor. You might shine a torch into the darkness to find a lost library card, but even light is bent and swallowed by the sheer mass of half-eaten Haribo packets, ensuring that whatever fell in remains forever inaccessible to the human eye.
Crucially, the bag is not a vacuum cleaner. It only holds onto your stuff because it is incredibly dense, meaning it will happily sit on your desk exerting the same gravitational pull as a pile of books of equivalent weight. You can orbit the bag safely from across the room without being sucked into its event horizon, provided you do not get close enough to see the mysterious, calcified remains of last term's ham sandwich. It is a terrifying, singular point of infinite density, containing everything you have ever lost, including your dignity.
Where the analogy breaks downA black hole does not eventually produce a smell like a mouldy banana.