3 TERRIFYING Physics Ideas to Keep You Up At Night

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Physics constantly tells us weird and wonderful things about the world around us. But sometimes it comes up with ideas that are downright scary. So here are 3 terrifying physics ideas to keep you up at night.

The first is the heat death of the universe. According to the the 2nd Law of Thermodynamics, a quantity called entropy always increases (or stays the same) in the universe. Entropy is one way of saying "disorder". This means that overall, disorder always has to increase (even though it can temporarily decrease in some parts of the universe). Eventually, this means all available energy will be wasted as heat, and there will be no useful energy left to do work. Life as we know it would not be able to exist as the universe wastes away.

The second scary idea is caused by the expansion of the universe. Every point of space in the universe is expanding. And as a result, all objects within that space are moving away from each other (unless they're bound to each other by gravity). Because every point is expanding, very far away objects have more space between them to do the expanding. And because of this, some very far objects can move away from each other faster than the speed of light. This means that not even light can reach between them, and hence they have no way of communicating. Eventually, if the universe continues to expand like we think it is doing right now, we won't be able to contact anything outside our own galaxy because even light will be too slow to get from us to them.

The third idea is that we could be in a yet-to-form black hole, and we would never know until it's too late. A perfect sphere of infalling photons (photons of light moving towards the centre of the sphere) would eventually form a black hole. The event horizon would very quickly grow outwards from the centre point, until the photons cross it. At this point, the event horizon will stop growing and the black hole will be fully formed. Someone in the region of space where the black hole formed, will have no way to detect the photons of light coming from far away, nor the event horizon growing from the centre. They would only know once they are INSIDE the black hole, and at that point there is no escape!

Happy Halloween lol

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Chapters:
0:00 - I normally like physics... but some ideas are scary tbh
0:38 - The heat death of the universe
4:11 - All alone in the expanding universe
6:11 - We could be in a black hole and not know... until it's too late