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The gravity of the visible matter is not strong enough to form galaxies and complex structures.
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Stars would more likely be scattered all over the place and not form galaxies.
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So we know there is something else inside and around them.
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But besides being able to calculate the existence of dark matter, we can see it, kind of.
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Places with a high concentration of dark matter bend light passing nearby.
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So we know there's something there that interacts with gravity.
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Right now, we have more ideas about what dark energy is not than what it is.
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We know dark matter is not just clouds of normal matter without stars because it would emit particles we could detect.
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Dark matter is not antimatter because antimatter produces unique gamma rays when it reacts with normal matter.
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Dark matter is also not made up of black holes, very compact objects that violently affect their surroundings,
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Basically, we only know three things for sure.
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One, something is out there.
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Two, it interacts with gravity.
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Three, there is a lot of it.
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Dark matter is probably made up of a complicated exotic particle that doesn't interact with light and matter in a way we expect, but right now, we just don't know.
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Dark energy is even more strange and mysterious.
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We can't detect it, we can't measure it, and we can't taste it, but we do see its effects very clearly.
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In 1929, Edwin Hubble examined how the wavelength of light emitted by distant galaxies shifts towards the red end of the electromagnetic spectrum as it travels through space.
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He found that fainter, more distant galaxies showed a large degree of redshift.
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Hubble determined that this was because the universe itself is expanding.
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The redshift occurs because the wavelengths of light are stretched as the universe expands.
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More recent discoveries have shown that the expansion of the universe is accelerating.
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Before that, it was thought that the pull of gravity would cause the expansion to either slow down or even retract and collapse in on itself at some point.
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Space doesn't change its properties as it expands.
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There's just more of it.
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New space is constantly created everywhere.
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Galaxies are tight-bound clusters of stuff held together by gravity, so we don't experience this expansion in our daily lives, but we see it everywhere around us.
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Wherever there is empty space in the universe, more is forming every second.
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So dark energy seems to be some kind of energy intrinsic to empty space.
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Empty space has more energy than everything else in the universe combined.
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We have multiple ideas about what dark energy might be.
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One idea is that dark energy is not a thing, but just a property of space.
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Empty space is not nothing.
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It has its own energy.
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It can generate more space, and it's quite active.
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So as the universe expands, it could be that just more and more space appears to fill the gaps, and this leads to a faster, expanding universe.
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This idea is close to an idea that Einstein had back in 1917 of a concept of a cosmological constant, a force that counteracted the force of gravity.
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The only problem is that when we tried to calculate the amount of this energy, the result was so wrong and weird that it only added to the confusion.
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Another idea is that empty space is actually full of temporary, virtual particles that spontaneously and continually form from nothing and then disappear into nothing again.
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The energy from those particles could be dark energy.
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Or maybe dark energy is an unknown kind of dynamic energy fluid or field which permeates the entire universe,
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But if it exists, we don't know how and where or how we could detect it.
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So there are still a lot of questions to answer.
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Our theories about dark matter and dark energy are still just that, theories.
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On the one hand, this is kind of frustrating.
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On the other hand, this is frontier science, making it very exciting.
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It shows us that no matter how much we feel we're on top of things, we're still very much apes with smartphones on a tiny, fragile island in space,
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There is so much left to learn, and that is awesome.
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This video is supported by the Australian Academy of Science, which promotes and supports excellence in science.
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Learn more about this topic and others like it at nova.org.au.
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It was a blast to work with them, so go check out their site.
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Our videos are also made possible by your support on patreon.com.
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If you want to support us and become part of the Kurzgesagt bird army, check out our Patreon page.
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Sometimes the world feels, hmm, boring.
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We've visited all the remote islands, conquered the Arctic, and penetrated the deepest jungles.
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But there is still one place to explore.
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It's a wet and deadly desert inhabited by mysterious creatures living in total darkness.
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Let's dive down.
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When we look at the sheer scale of the Earth's oceans, it's hard to believe that less than 2% of all biomass on Earth lives here.
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And of that small percentage, around 90% is located close to the surface in the first 200 meters.
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This is where we begin our journey.
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Here, light can still penetrate the water, which allows photosynthesis to occur.
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Phytoplankton, trillions and trillions of single-celled algae and bacteria, make up the foundation of the ocean's ecosystem,
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and they're consumed by bigger plankton, who are consumed by other species.
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The sea floor at this depth is akin to the Amazon rainforest, and is often covered with coral reefs, algae,
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So far, we've focused most of our attention on this comparatively pleasant environment, where we fish, swim, pollute, and do science.
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So, let's dive deeper.
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Moving from familiar coastal waters into deeper, more remote waters, we eventually reach the edge of the continental shelf,
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With every additional meter of water, light fades drastically, which means there are basically no more plants,
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and the seemingly steep continental slope begins to remind us of the surface of the Moon.
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Looking out, we're faced by what seems to be endless open water.
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Let's leave the slope behind us, and enter what's known as the twilight zone, the portal to the deep sea.
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As we sink down further, the water pressure rises to deadly levels.
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The deepest scuba dive ever came in at 332 meters.
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At that depth, the pressure is like having 200 cars stacked on top of you.
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Yet we've only completed 3% of our journey.
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While this region seems pretty grim, many fish and other animals actually spend at least half their lives down here.
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During the day, it's a good place to rest and recover, hidden from predators in the vast, dark waters.
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At night, they can travel more safely into shallower zones to feed in the food-rich surface waters.
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In this transition zone between twilight and darkness, light becomes a powerful tool.
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Over 90% of the species indigenous to this deep environment use bioluminescence chemicals to create light.
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They do so as camouflage against the very faint sunlight to send signals to potential mates or to confuse and scare attackers.
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Or, they use light to hunt.
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Another tool for survival in the dark is teamwork.
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At around 700 meters, we encounter a colony of Siphonophores.
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They can be up to 50 meters in length, but are only as wide as a broomstick.
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To attract prey, a colony creates a tragically beautiful bright blue or red light and deploys a curtain of tentacles filled with toxic needles that kill anything that comes too close.
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But most species living down here have to rely on an unlikely resource, marine snow.
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It consists of dead plant or animal parts, fecal matter, shells, sand or dust.
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Even though this doesn't sound very tasty, without this crucial resource, life in the deep sea would starve.
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It's in this area that the most fascinating battles between two unlikely enemies could happen.
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Sperm whales hunt and attack giant squid the size of a house.
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While the squid fight back ferociously, they probably don't stand a chance, but they do leave permanent marks on their killer's skin.
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As we reach 1000 meters, deeper than the tallest structure built by humans, we need to be careful.
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This is the Midnight Zone, a place of utter darkness.
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At these depths, it's harder for a human to take a swim than to take a walk in space.
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Finding food down here is really hard, so life had to adapt and become extremely energy efficient.
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They're covered in tiny stiff hairs which brush food from the water.
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This saves a lot of energy compared to actively catching food.
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For carnivorous fish, it's much harder to find food since living prey is quite rare down here.
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