As far as we know, we earthlings have never made contact with extraterrestrials. (Right, conspiracy theorists?) 20th-century physicist Enrico Fermi thought that was a bit odd, considering the overwhelming likelihood that alien life exists. In 1950, his "where are all the aliens?" question became known as the Fermi paradox. Think about it: what are the chances that life on Earth is the only life in the impossibly gigantic universe? There are probably 100 Earth-like planets for every grain of sand in the world... yet we've never encountered a life form not born of this planet. What's the deal?

One explanation of the Fermi paradox is the zoo hypothesis. It's admittedly a freaky situation to consider, but here it is: aliens know we earthlings are here, but they're purposely avoiding contact with us, opting to study us from afar instead. 

This hypothesized answer to the Fermi Paradox was proposed by MIT astronomer John A. Ball in 1973. It's named the zoo hypothesis because it suggests that life on Earth is just like an animal at the zoo—look, but don't touch! Ball suggests that maybe alien civilizations are advanced enough to know not to influence our primitive society, or not to get involved with other intelligent lifeforms (the Prime Directive, anybody?).

A more popular answer to the Fermi Paradox is that alien life is still very primitive, or has already come and gone. At this point, it's really anyone's guess. These videos may help you consider the possibilities of alien lifeforms, and where, how, and if they exist.

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What Would Happen If The Sun Disappeared ?

If the sun suddenly blinked out of existence, you'd have nothing to worry about.—for the first eight minutes, anyway. After that, all hell would likely break loose. Still, it wouldn't be the instantaneous end to life on Earth that you might think.

When The Light Go Down.

Light takes roughly eight minutes to reach Earth from the sun. For that reason, if the sun disappeared, we'd still see it in the sky for another eight minutes. But what about gravity? The sun is the anchor point of the solar system—at 333,000 times the mass of Earth, it exerts a hefty pull that keeps the planets locked in their orbits. If all that gravitational force disappeared, it would still take us eight minutes to feel it. That's because, according to Einstein's theory of relativity, gravity travels at the same speed as light. So go ahead, watch the rest of that Netflix episode. You'll be golden for another eight minutes.

Chaos Creeps In Slowly.

After that, though, Earth still wouldn't be snuffed out. Electricity would still work, and it would still take up to an hour for the light from our planets to be reflected back to Earth, so there would be a peaceful glow in the sky. With no sunlight, photosynthesis would stop, but that would only kill some of the plants—there are some larger trees that can survive for decades without it. Within a few days, however, the temperatures would begin to drop, and any humans left on the planet's surface would die soon after. Within two months, the ocean's surface would freeze over, but it would take another thousand years for our seas to freeze solid. By then, however, the atmosphere would collapse, radiation would seep in, and Earth would be an inhospitable wasteland drifting aimlessly through space. Lucky for you, the sun is showing no signs of disappearing any time soon.