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Our planet is full of mysteries that science still struggles to explain. Strange lights appear in the sky with no clear source, bizarre natural formations behave in ways that defy logic, and geological structures hide secrets far older than humanity itself. Even places we've seen a thousand times can conceal something enormous like one of Earth’s biggest impact sites sitting unnoticed for ages. Scientists have studied these mysteries for decades, yet many of them remain unsolved, raising new questions with every discovery.
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00:01It may seem that today, with our quite advanced technological development, science can explain pretty much any natural phenomenon.
00:09But that's not always true. Some things still stump experts and make them build exotic theories.
00:16Let's have a look at some of such phenomena.
00:21Hestalen lights are a puzzling phenomenon you can observe in Hestalen Valley in central Norway.
00:27The thing is that some highly unusual lights can often be seen over the valley.
00:33They appear mostly at night. The lights are typically white, but they occasionally turn yellowish or reddish.
00:40Nobody knows what makes them change color.
00:43What's more, the lights can move.
00:47And if at one moment they seem to motionlessly hang in midair, the next minute they may travel somewhere at lightning speed.
00:54There's no certain place where they appear, and you can't predict the duration of their stay.
01:00Despite all the research that has been done since the 1980s, scientists are still unable to explain this phenomenon as well as such weird behavior of lights.
01:10The sardine run lasts from May to July.
01:17During this time, millions of sardines swim northward along South Africa's east coast.
01:24You can probably imagine a feeding frenzy that starts at that time.
01:29It's believed that the water temperature must get lower than 70 degrees a file for the migration to begin.
01:35This mushroom with a difficult name, Choreoactis geester, is only found in Japan and Texas.
01:44And it makes scientists extremely confused.
01:47Why these two locations?
01:49It's true that they're on the same latitude, but these places are definitely not the only ones.
01:56Plus, they're so far away from each other.
01:58After studying the mushroom's DNA in 2004, experts suggested that the two populations might have been separated into two lineages around 19 million years ago.
02:11On Central Flores Island, there's a 3,000-foot-high volcano called Kelamutu.
02:22At its base, there is a small town.
02:25If you want to see the main attraction of the area, you'll most definitely stay there.
02:30And the attraction I'm talking about is three lakes.
02:33Known as the Lake of Old People,
02:36the Lake of Young Men and Maidens,
02:39and the Enchanted Lake.
02:41Why are these lakes so popular and attract so many people?
02:48They inexplicably change colors.
02:52Ancient legends claim that the lakes are the final resting place of human souls,
02:57and those souls stay in different lakes according to their actions.
03:03As for scientific research,
03:05no one has yet conducted any to discover the cause of the changing colors.
03:09But theorists suppose that it might be due to underwater volcanic activity.
03:17It might be pushing minerals to the lake's surface.
03:22Then, depending on what elements those are,
03:25the lakes can turn blood red,
03:27bright turquoise,
03:29or olive green.
03:30But the coolest thing?
03:33The lakes are never all the same color at the same time.
03:38This phenomenon is unique and hasn't been observed anywhere else in the world.
03:42Those who have ever heard an annoying noise a kettle makes to inform you the water inside is boiling
03:51can imagine what the whistle sounds like.
03:54Even though this noise isn't as blood-curdling as some other unexplained sounds,
03:58it doesn't make the whistle any less mysterious.
04:01It's incredibly elusive.
04:04In 1997,
04:06only one underwater microphone was able to pick it up.
04:09At that time,
04:11researchers didn't manage to pinpoint the source of the noise.
04:15The most likely cause of the unusual sound is an eruption of one of the submarine volcanoes.
04:21But once again,
04:22there's not enough proof to make sure.
04:24There's probably no person on Earth who doesn't marvel at the mystery of the Bermuda Triangle.
04:33But not everyone knows that there is another triangle.
04:38Not so famous,
04:39but just as dangerous.
04:42Dragon's Triangle,
04:43or the Devil's Sea,
04:45lies in the area between Japan and the islands of Bonin.
04:51It covers a big part of the Philippine Sea as well.
04:54That's why people also call this place the Pacific Bermuda Triangle.
05:00Surprisingly,
05:01or not really,
05:03the Devil's Sea is situated exactly opposite the Bermuda Triangle.
05:09Ships and planes tend to disappear here with the same regularity as in the North Atlantic Triangle.
05:16People also report seeing ghost ships in the open sea.
05:20And while scientists provide logical reasons for the vanishing vessels and aircraft,
05:26most people still believe in the paranormal nature of Dragon's Triangle.
05:30For the first time,
05:34a bizarre sound later called the upsweep
05:37was registered in 1991 in the Pacific Ocean.
05:42One of the most unusual things about the sound
05:45is that it's constantly changing.
05:47It varies from high to low frequencies
05:49and then back again.
05:52You can hear it better in the spring and fall
05:54than in the winter and summer.
05:57The sound travels from the bottom of the ocean toward its surface.
06:03Scientists do have a theory explaining this phenomenon.
06:07They think it might be the activity of undersea volcanoes
06:10that causes the sound.
06:12Hot lava that's pouring into the ice-cold ocean water
06:16can theoretically produce such noise.
06:19But researchers haven't found any evidence to confirm this theory yet.
06:27On the thin Curonian spit splitting the Baltic Sea
06:31from the Curonian Lagoon,
06:33there is one of the most bizarre places on Earth.
06:36Locals call this area
06:38The Dancing Forest
06:39because pine trees in this forest
06:41have shockingly unusual shapes.
06:44They twist in spirals and circles along the ground.
06:48There are some theories why it could be happening, of course.
06:51Some people claim that huge amounts of positive
06:54and negative energies once clashed in that spot.
06:58More down-to-earth individuals believe
07:00that the reason is geological.
07:02Sandy soil in the area
07:04is too unstable to hold trees growing upright.
07:07The most popular is the idea
07:09that strong winds blowing from the water
07:11influence the shape of the trees.
07:14In any case,
07:16experts haven't come to the final conclusion yet.
07:22Potomsky Crater
07:23is described as a mount with a perfect shape.
07:27Its size is more than that of a 25-story building.
07:30It sits in the middle of the woods
07:33with its top chopped off
07:34and presents quite a sight.
07:37In fact,
07:38the shape of the crater is pretty unusual.
07:41It has a rounded inner dome
07:42that is about 40 feet high.
07:45At first sight,
07:46this formation looks like a volcano.
07:49But after a closer examination,
07:51you might realize that it's not the case.
07:53The dome in the center of the cone
07:57is extremely unusual for a volcano.
08:00In addition,
08:01there haven't been any volcanoes in this region
08:03for millions of years,
08:05while the age of the crater
08:06is estimated to be about 250 years.
08:12The weird shape that the crater has
08:14is like nothing scientists have ever seen.
08:18This,
08:19as well as the fact that any theory
08:21fails to explain the origin of the formation
08:23adds to the mystery around it.
08:27And that's not the most terrifying thing.
08:30After researchers analyzed
08:32the growth rings of the trees near the crater,
08:34they found out
08:35that the trees experienced a period
08:37of strangely accelerated growth
08:40that lasted for 40 years.
08:43After that,
08:44they began to grow as they were supposed to.
08:46The level of radiation near the crater
08:49is also higher than in the nearby areas.
08:52No one has an explanation for this fact.
08:57On top of that,
08:58nothing grows on the blood-chilling formation.
09:01Perhaps because the crater
09:03also has a lovely habit
09:04of constant shifting.
09:06It rises and falls,
09:08influenced by some inexplicable force.
09:13Locals believe in the evil
09:14that dwells in that place.
09:15While exploring the Amazon rainforest,
09:21researchers discovered gigantic geoglyphs,
09:25their geometrical drawings
09:27carved into the ground.
09:30The trenches were as large
09:31as 36 feet wide
09:33and 13 feet deep.
09:36They were created at different times,
09:38most between the 1st to the 15th century.
09:41There are more than 450 geoglyphs
09:46in the north of Bolivia and Brazil.
09:49The most ancient of them
09:51could have been created
09:52around 3,000 years ago.
09:55The huge earthworks were likely used
09:58for common meetings and discussions.
10:01But scientists haven't found enough proof yet.
10:05About 2 billion years ago,
10:10a massive asteroid crashed into Earth,
10:13leaving behind total destruction
10:14and what we now call
10:16the Vreda Fort Crater in South Africa.
10:19And get this,
10:21this space invader
10:22might have been way bigger
10:23than scientists originally thought,
10:26possibly twice the size of the asteroid
10:28that wiped out the dinosaurs.
10:31Nowadays,
10:31the Vreda Fort Crater
10:33is about 99 miles across,
10:35which makes it
10:36the biggest visible crater on Earth.
10:38But technically,
10:39it's still smaller
10:40than the Chicxulub Crater in Mexico.
10:42The latter is about 112 miles,
10:45and it was left
10:46by the infamous dinosaur distractor
10:4866 million years ago.
10:50But the thing is,
10:52craters don't stay the same forever.
10:54Over time,
10:55erosion wears them down.
10:57That's why they start looking
10:58smaller than they used to.
11:00And scientists think
11:01that when the Vreda Fort Crater
11:02first formed,
11:03it could actually reach
11:04174 miles across.
11:07That means
11:08it was the biggest impact site
11:10Earth has ever seen,
11:11even though
11:12it looks smaller today.
11:15Just imagine
11:16how insane that impact
11:17must have been.
11:18A space rock
11:19that would have sent shockwaves
11:20ripping across the planet,
11:22triggered enormous wildfires,
11:24and completely changed the climate.
11:26The asteroid likely hit Earth
11:28at a very, very high speed.
11:30But since this catastrophe
11:32happened billions of years ago,
11:33way before dinosaurs
11:35or even complex life
11:36saw the light of day,
11:38it didn't wipe anything out
11:39like the Chicxulub asteroid did.
11:42At the same time,
11:43recently,
11:44researchers have realized
11:45that the asteroid
11:46might have been even bigger
11:48than they thought previously,
11:49up to 15.5 miles wide.
11:52As for the speed
11:54at which it slammed into Earth,
11:56it could reach
11:57a staggering
11:5756,000 miles per hour.
12:02Now,
12:03figuring out how big
12:04Vreda Fort originally was,
12:05that's been a bit of a headache.
12:08The main issue
12:08is that it's super old,
12:10and we're talking about
12:112 billion years old.
12:13No wonder that
12:14over that much time,
12:16erosion has kind of
12:17worn it down.
12:18So it's hard to tell
12:19just how huge it once was.
12:20But it's not just erosion
12:23causing the problem.
12:25Over the years,
12:26new layers of rock
12:27have built up
12:27over parts of the crater,
12:29and they've covered up
12:30most of the original structure.
12:32That's why now
12:33only little pieces
12:34of the raised rim are left,
12:35and this makes it even harder
12:37to get a clear idea
12:38of how big it was.
12:41So,
12:42scientists started looking
12:43at the minerals
12:44around the crater,
12:45like quartz
12:45and zircon.
12:47They discovered
12:48that those were all
12:49messed up
12:49by the asteroid's
12:50impact.
12:51They had tiny fractures
12:52caused by the blast.
12:54Researchers studied
12:55those damaged crystals
12:56and managed to figure out
12:57how far the explosion
12:59actually spread.
13:01Equipped by this
13:02new knowledge,
13:03scientists now believe
13:04that their latest estimates
13:05of the size of the asteroid
13:06are the most accurate ones.
13:09The reason why
13:10we haven't heard much
13:11about this disastrous impact
13:13is that,
13:14unlike the Chicxulub asteroid,
13:16which wiped out the dinosaurs
13:17and reshaped life on Earth,
13:19the Vredafort asteroid
13:20hit at a time
13:22when Earth
13:22was a very different place.
13:24There were no trees,
13:26no animals,
13:27just single-celled life
13:28in the oceans.
13:29That means
13:30no mass extinction,
13:32no burning forests,
13:33no fossilized evidence
13:34of chaos.
13:35But,
13:36scientists think
13:37it still had
13:38a massive impact
13:39on the planet.
13:40It might have changed
13:41the climate
13:41even more dramatically
13:43than the asteroid
13:44that ended dinosaurs.
13:45But since we don't have
13:47much direct evidence
13:48of the disaster,
13:50studying what's left
13:50of the Vredafort crater
13:51is one of the only ways
13:53to understand
13:54just how powerful
13:55this impact was.
13:57Even though it happened
13:58billions of years ago,
14:00learning about this impact
14:01can help us understand
14:02the history of our planet
14:03and maybe even prepare
14:05for future asteroid threats.
14:08After all,
14:08they could be similar
14:09to what happened in Siberia
14:11at the beginning
14:11of the 20th century
14:13pretty recently.
14:15It was a warm morning
14:17June 30th, 1908
14:19when the sky
14:20suddenly lit up
14:21with a blinding flash.
14:23What followed
14:24was an explosion
14:25so powerful
14:26that it remained
14:26a mystery for decades.
14:29Known as the Tunguska event,
14:31it was one of the most
14:32baffling disasters
14:33in history.
14:35Scientists suspected
14:36an asteroid impact
14:37similar to the one
14:38that wiped out
14:39the dinosaurs.
14:40But there was
14:41one eerie problem.
14:43No crater
14:43was ever found.
14:45The explosion
14:46struck deep
14:47in the remote forests
14:48of Siberia
14:48near the Podkamanaya-Tunguska River.
14:52The blast was beyond
14:52anything seen before,
14:54flattening around
14:5580 million trees
14:57across an area
14:58of 830 square miles.
15:01The sheer force
15:02of the event
15:03was mind-boggling.
15:04It was strong enough
15:05to devastate the landscape,
15:07scorch the ground,
15:08and wipe out
15:09countless animals.
15:11According to witnesses,
15:12there was an eerie glow
15:13in the sky,
15:14which was followed
15:15by a streaking fireball
15:16with an intense
15:17bluish light.
15:19It was brighter
15:20than the sun.
15:21Moments later,
15:22there was a deafening blast.
15:24The shockwave
15:25was so powerful
15:26that it shattered windows
15:27hundreds of miles away,
15:29and people
15:29were knocked off
15:30their feet.
15:32Yet,
15:32despite the destruction,
15:33the source of the explosion
15:35left no obvious trace.
15:37Later,
15:38scientists finally
15:39started to understand
15:40what had occurred
15:41on that day.
15:43Imagine a meteoroid
15:44racing into Earth's atmosphere,
15:46transforming into
15:47a blazing meteor.
15:49It's traveling so fast
15:51that the air in front of it
15:52compresses and heats up,
15:54setting it on fire.
15:55But it's so large
15:57that it doesn't just
15:58burn up all of a sudden.
15:59It explodes.
16:01When that happens,
16:02the blast releases
16:03so much energy
16:04that a powerful shockwave
16:06spreads out.
16:07And since the explosion
16:08happens in the air,
16:09it leaves no impact crater.
16:14Back in the early 1900s,
16:15with limited technology
16:17and the remote location,
16:18scientists were left
16:19with a puzzle.
16:21Only much later
16:21did they eventually conclude
16:23it had been an airburst,
16:25where an object explodes
16:26high in the atmosphere,
16:27never striking the ground,
16:29but releasing enough energy
16:30to devastate the area.
16:32Most likely,
16:33it was a giant asteroid
16:35about the size
16:36of a 25-story building.
16:38It could have been moving
16:39at around 33,500 miles per hour
16:42and exploding
16:43about three to six miles
16:44above Earth's surface.
16:48Another wild story
16:49happened back in the late 90s,
16:51but it wasn't Earth
16:52that was affected.
16:54A comet got stuck in orbit
16:56around Jupiter.
16:57One day,
16:58it got too close,
16:59and Jupiter's immense gravity
17:01broke it apart,
17:02turning it into
17:03a bunch of pieces.
17:05Some of them
17:05were as big
17:06as half a mile across.
17:08Scientists were curious
17:10because they didn't know
17:11what would happen
17:11when those pieces
17:12hit the planet.
17:14And in July 1994,
17:16the moment came.
17:18The comet's broken up pieces
17:20started crashing into Jupiter,
17:21one after the other.
17:22Over six days,
17:2521 chunks of the comet
17:26smashed into the planet
17:27at insane speeds,
17:29like 37 miles per second.
17:32That's more than
17:33130,000 miles per hour.
17:35The impacts were so powerful
17:37that they heated up
17:38Jupiter's atmosphere
17:39to a mind-boggling
17:4053,000 degrees Fahrenheit,
17:43which is way hotter
17:44than the Sun's surface.
17:46When each chunk hit,
17:48it sent massive plumes
17:49of material
17:50flying out of Jupiter,
17:51like when you throw
17:52a rock into a pond,
17:53but way bigger.
17:56Some of these plumes
17:56shot up almost
17:571,900 miles
17:59into the sky.
18:00Afterward,
18:01big dark scars
18:02appeared in Jupiter's atmosphere,
18:04and they stayed visible
18:05for months
18:06as the debris spread out
18:07across the planet.
18:09But this wasn't
18:10just a cool space event.
18:12Scientists actually
18:13learned a lot from it.
18:14Those dark impact marks
18:16helped scientists
18:17track the winds
18:18in Jupiter's stratosphere.
18:20The crashes even
18:21caused temporary changes
18:22in Jupiter's glowing auroras,
18:25showing that the planet's
18:26magnetic field
18:27was affected by particles
18:28from the explosions.
18:31Plus, the comet fragments
18:32didn't just make a mess.
18:34They also left behind
18:35new chemicals
18:36in Jupiter's atmosphere.
18:38Plus, some chemicals
18:40were also exhumed
18:41from the lower atmosphere.
18:42Some molecules
18:44like ammonia
18:44broke down over time,
18:46but others,
18:47like hydrogen cyanide
18:48and water,
18:49are still floating
18:50around Jupiter today.
18:52This helped scientists
18:53understand how different
18:54chemicals react
18:55and mix
18:56in Jupiter's atmosphere.
18:58Comet Shoemaker-Levy 9
19:00was a wake-up call.
19:02It proved that
19:03massive space collisions
19:04still happen
19:05in our solar system.
19:07That's one big reason
19:08why NASA started looking
19:09into how we can track
19:11and prepare
19:11for any future impacts
19:13that might threaten Earth.
19:15Whether it's learning
19:16more about asteroids
19:17and comets,
19:18or about how giant impacts
19:20shape planets,
19:21the importance
19:22of such discoveries
19:23is undeniable.
19:24That's it for today.
19:29So hey,
19:29if you pacified
19:30your curiosity,
19:31then give the video a like
19:32and share it with your friends.
19:34Or if you want more,
19:35just click on these videos
19:36and stay on the bright side.
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