Expensive particle colliders are not the only way to explore far-out physics. It seems that water gushing from a tap and hitting a sink behaves like a white hole-the theoretical opposite of a black hole. A black hole is a dense concentration of mass surrounded by an extremely powerful gravitational field. Nothing that falls within a certain radius surrounding it, known as the event horizon, escapes. A white hole is the opposite: its event horizon allows things to escape but prevents anything from entering. However, so far white holes only exist in theory, so cannot be studied observationally.
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