![]() ![]() And if you go back to 230 million years ago, you could watch the early dinosaurs walk for the first time on two legs.īefore that can happen, though, the Earth has to go through what would be known as the Great Dying, also called the Permian extinction. Keep going back another 20 million years, and you could watch the first early mammals, small and nocturnal, crawl around in the dark. But the dinosaurs wouldn’t have had the chance to evolve into the giant creatures we learned about without this event. As the land breaks apart, the lava eruptions will be so massive they kill almost 80% of the species on Earth. This is the last you’ll see of them, so enjoy this moment.Īs you travel 200 million years back in time, you’ll witness the breakup of Pangea, the mass of land that will become the continents. It took hundreds of millions of years to get plant life to evolve into this form. Go back 130 million years, and you’ll see the first flowers bloom. But without this event, mammals like us may have never taken over the planet. With the Sun blacked out and the land flooding, the last of the dinosaurs died out. The crash also set off massive volcanic eruptions across the world. The impact caused a tsunami and filled the air with dust and debris. Step back to 65 million years ago, and you’d find yourself under the giant asteroid that created a global extinction event. With skeletons weighing under 30 g (1 oz), these early primates evolved into us. In other words, Bill and Ted's Excellent Adventure is, technically, scientifically accurate.Travel to 60 million years ago, and you’ll see the first primates emerge from the humid rainforests of Asia. How does it translate to human time travelers? Well, quite simply, you can go back in time and punch, kick, mace, give a noogie to and/or trip your grandfather, but you can't kill him, otherwise you wouldn't exist to kill him in the first place. This explanation was discovered and supported through mathematical calculation by physicist Kip Thorne. The solution to this paradox must be that the billiard ball is only lightly tapped by itself: it still enters and exists the time machine, but at a slightly different angle. The implication is that, as soon as I roll the ball towards B, the same ball will fly out of A and knock it off its path! A paradox is created: if the ball is knocked away from entering B, how could it then come out of A? Say I set up two small corresponding time machines, A and B, and I position them so that when I roll a billiard ball into B, the ball travels back in time, and reappears in the past through A, with a trajectory aimed to disrupt the ball's original path into B. Your own existence refutes such an event ever happening. ![]() You simply couldn't kill you grandfather, because you're alive to do it. Developed by Russian physicist Igor Novikov, the principle of self-consistency maintains a time traveler cannot change the past because he or she was always a part of it. Travelling in time would then seem like hopping from one train track to another, with new universes generated for every action you took.īut the many-worlds interpretation isn't considered to be as well supported as another, more conservative, theoretical approach, which stands by the principle of self-consistency. In other words, you could kill your grandfather, and alter history, making it so that you were never born, but in doing so, the universe would split into separate branches a new universe, with a different future, would branch into creation where you've killed your grandfather, while the universe from where you travelled would exist as it did before. ![]() A minority of physicists, the radicals, you could say, believe the universe doesn't have one world history, but an infinite number of parallel histories: stemming from quantum mechanics, the many-worlds interpretation postulates that, for every observation or decision on earth, a new world history is created. Would you be able to alter previously recorded events? Or perhaps create new events, which seemingly have no beginning? Further insight into these questions is made possible with the many-worlds interpretation. ![]()
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