From the unsettling to the mind-bending, cosmology is full of ideas that make you question everything you thought you knew. Science isn't always comforting β sometimes it's terrifying.
Put the items in your preferred order.
The Simulation Hypothesis
What if the entire universe β you, your nan, your disappointing pension β is just a sophisticated computer simulation? Elon Musk believes it. Oxford philosophers argue about it. Sleep tight.
The Heat Death of the Universe
Eventually, billions of years from now, all stars will burn out, all matter will decay, and the universe will reach a state of absolute cold nothingness. There is no escape, no sequel, no reboot.
The Many-Worlds Interpretation
Quantum mechanics suggests every decision spawns a parallel universe where the other outcome happened. Somewhere out there, a version of you never voted for Brexit β or did, twice, proudly.
The Great Filter
Fermi's Paradox asks why we've never found alien life, and the Great Filter theory suggests some catastrophic barrier destroys intelligent species β and we might not have passed it yet.
Boltzmann Brains
Statistical physics allows for the random spontaneous assembly of a conscious mind floating in space β your entire existence, memories and all, could be a cosmic fluke that appeared a second ago.
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