Definitely the big deadly big back holes!
But an interesting question is: how small can a big deadly black hole actually be? Some people think that you can make ‘micro black holes’ – which are just as cool and deadly, but the same size as an atom!
So I guess those would be my favourite – the atomic-sized deadly black holes 🙂
(We don’t need to be too scared of them though, because they (probably) won’t come to Earth any time soon)
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