Several dozen years ago, even science fiction couldn’t imagine the existence of black holes in the Universe, and now their presence is recognized by the scientific community. Black holes are so good at producing energy that some scientists want to power spaceships with them. Super-dense stellar black holes can squeeze several times the mass of the Sun into a city-sized area. Sometimes black holes ‘spit out’ planet-sized objects at 20 million miles per hour!
Interested? How about learning some cool facts about black holes and, by the way, look at how small or large they can be? Well, scientists measure black holes by their Schwarzschild radius – the distance from where its gravity starts and the ‘hole’ itself. Our smallest black hole has a 7-mile radius. Number 2 is just 8 miles. Little black holes like this one can only be spotted when they ‘eat’ the material of passing stars. Big black holes can produce enough material to create new stars, which form outside their parent galaxy. And guys, black holes can be really, really big…
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