There's a needle approaching Earth at the speed of light. A needle? Pfft! That's no big deal, right? Well, unfortunately, it's a very big deal. A needle traveling this fast can cause devastating effects on Earth. But why? What kind of destruction could this tiny little needle cause? And in what scenario would this be possible?

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Enjoying this video? Dive even deeper into the world of science and discovery with Popular Science, the free streaming channel bringing you more of what you love from What If, plus epic explorations in engineering, rocket launches, movies, space, and Earth sciences here.

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What If is a mini-documentary web series that takes you on an epic journey through hypothetical worlds and possibilities. Join us on an imaginary adventure through time, space, and chance while we (hopefully) boil down complex subjects in a fun and entertaining way.

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If suddenly, you started to shrink in size, how long would it take until you became as small as a particle of dust? Why would things look different to your eyes? And why should you stay away from these grabby things? Today, you'll be scaling down by 1 cm every second, from human-sized all the way to the size of a subatomic particle.

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Being twice as massive as all the other planets in the Solar System combined, Jupiter has astronomical pressure. This planet is basically a gigantic ball of hydrogen and helium. It doesn't have a solid surface you could step on. You'd fall all the way through its atmosphere, although it wouldn't be that long of a fall for you.

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Forget flat Earth. Let me introduce you to Earth shaped like a pizza. It might look delicious. But it would be a scorching, violent, literally breathtaking place.

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A small but incredibly fast unwanted guest is about to swing past Earth at the speed of light. This is the tiniest black hole in the Universe. Despite its small size, could it rip our planet apart? We're sending black holes through Earth, from the tiniest black hole just 2 cm (3/4 in) in diameter to the most massive, stupendously large black hole. Things are about to get bad for you on Earth.

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Humanity’s nuclear arsenal is capable of destroying all life on Earth repeatedly. Maybe it's time we dispose of it far away. We might want to inhabit other planets in the future, so how about our closest star? How many nukes could we throw at the Sun? What would be the cost of this mission? And could we accidentally destroy our only source of daylight?

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Imagine Earth stretched into a giant dumbbell. Two worlds… one risky connection. Here’s what would actually happen!

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Jupiter may be the biggest planet in the Solar System, but its days are numbered. Today, we’re using Earth’s biggest, baddest bombs to blow the gas giant into oblivion. How many nukes would you need to do the job? What obstacles would these rocket-bound bombs encounter on the way? Would one nuclear explosion ignite the entire planet? What are Kirkwood gaps?

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What Earth do you live on? A round one? Flat one? Maybe your world is resting on the back of a huge cosmic turtle? What about a hollow Earth? Just a planet's shell levitating around absolutely nothing. How would the laws of physics work on that hollow Earth?

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