00:00In space, making the wrong decision can cost you your life.
00:04But if you solve all the riddles, you'll be safe.
00:07To activate the navigation system and return to Earth, you need to enter a three-digit code.
00:12You'll need to answer three questions to find the correct numbers.
00:16How many planets are there in our solar system?
00:19What is our planet from the Sun?
00:21How many satellites does Mars have?
00:30The code is 832.
00:36There are eight planets in the solar system.
00:38Earth is the third from the Sun.
00:40Mars has two satellites, Phobos and Deimos.
00:44At a research base on the moon Titan, one of the crew members turns out to be an extraterrestrial spy.
00:51Here are the suspects.
00:53An engineer who claims to be able to breathe the local air without a spacesuit.
00:58A cyberneticist with different eyes.
01:00An astrobiologist whose hands are constantly cold.
01:12The engineer who says they can breathe on Titan without problems can't be human.
01:17The atmosphere here is not suitable for breathing for us.
01:20Oh no!
01:22Two astronauts are floating in open space near their spacecraft.
01:26Only one of them is tethered to the ship.
01:28Who will reach it first?
01:30Or maybe they'll do it at the same time?
01:32The tethered astronaut will reach the ship first.
01:42They can pull themselves along the rope, controlling their movement and speed.
01:46The untethered astronaut can't move independently unless they push off something.
01:51If they do push off, they will move toward the ship but won't be able to adjust their trajectory or speed.
01:58Two female astronauts on the orbital station seem suspicious.
02:04One is always smiling and pretends to act normal.
02:07The other one who is also smiling but always keeping her hands in her pockets.
02:11Which of them isn't human?
02:13The correct answer is the blonde astronaut.
02:24The edge of green fur right here is a clear clue.
02:27She hides her furry ears and wears a spacesuit even inside the station so as not to give away her true nature.
02:34Astronauts on board the ISS complete an orbit of Earth every 90 minutes.
02:40They move from the bright side into the shadow and then back to the side of sunlight.
02:45So how many sunrises and sunsets do they see every Earth day?
02:58Sixteen times! You just need to divide 24 by 1.5.
03:02You're on a spacewalk to repair a satellite.
03:06But a sudden bang throws you away from the ship.
03:09Your maneuvering system is out of order.
03:11How will you get back?
03:13You can wait for help, staying still.
03:16You can try to move your arms and legs trying to swim back.
03:19Or you can drop one of the tools and push off from it.
03:32There's no air in space so flapping your arms is useless.
03:36But throwing a heavy object in the opposite direction will give you momentum in the right direction.
03:42You are an astronaut on a damaged spaceship and your navigation system is down.
03:47The only clue left is a message from an unknown intelligence.
03:52Your mission control tells you this code is using a simple letter number system.
03:57Which planet should you set your course toward?
04:00It's Mercury!
04:11You receive an alert.
04:12A giant asteroid, seven miles wide, is hurtling towards Earth.
04:17A scientist suggests,
04:19Let's launch a satellite to orbit the asteroid and use solar sails to gradually alter its trajectory.
04:25A mechanic says,
04:26Let's attach thrusters to the asteroid to nudge it off course over time.
04:31An astronaut offers to send a spacecraft with gravitational tractors to tow the asteroid away from Earth's path.
04:38Which course of action will you choose?
04:49Listen to the scientist.
04:51Using solar sails or reflective paint can change the asteroid's trajectory through the Yarkovsky effect,
04:56gradually deviating it from Earth's path without causing damage.
05:01Three planets sent you a signal offering to land there.
05:05The first one responded with a quick hand gesture.
05:08The second was silent and nodded.
05:10And the third one simply laughed.
05:12Which is the best place to go?
05:14The silent nod is the most universal gesture of agreement.
05:26So it's probably the safest option.
05:28A quick hand gesture can be either a greeting or a warning.
05:32And laughter without an explanation could mean some unpredictable civilization.
05:37There are three black holes in front of your ship.
05:40A small one.
05:41A large one.
05:42And a giant one.
05:43All of them suck in light and matter.
05:45But only one of them is a portal.
05:47Which one should you choose?
05:57Go for the giant black hole.
05:59The blue light is the radiation of a tunnel to another dimension, passing through its center.
06:04The small black hole is spinning so rapidly, its gravity will tear apart even light.
06:10The larger black hole is almost motionless, like an eternal trap.
06:15Space travelers are looking for a good place to land.
06:18There are three planets ahead of them.
06:20But two of them hide a serious danger.
06:23What planet should they choose?
06:25They should opt for the bright green planet with normal vegetation.
06:36The black forest on the first planet is the giant tentacles of a creature waiting for prey.
06:42The bumps on the second planet are the eyes of a colossal monster that could wake up at any moment.
06:48Suddenly you realize you're being pulled toward another black hole.
06:53Your only chance is to act fast before you cross the point of no return.
06:57You have three possible choices.
06:59Fire your engines at full power and try to fly straight away from the black hole.
07:05Use your thrusters to move sideways, trying to orbit around it and slingshot away.
07:10Eject all your cargo to make your ship lighter and escape gravity.
07:15What is it going to be?
07:25The second option is the safest.
07:27Trying to fly straight away is useless because the gravity is too strong.
07:31Ejecting cargo won't make a big difference in this case either.
07:34Your oxygen tank is leaking and you have only 10 minutes of air left.
07:39You find three emergency oxygen tanks, but only one is safe to use.
07:44Which tank should you choose to survive?
07:54If tank C is telling the truth, then tank A is lying, meaning it's not 100% safe.
08:00That would mean tank B is the safe one.
08:03But if tank C is lying, that still makes tank A unsafe.
08:07Either way, tank B is your best choice.
08:10Two space crews are competing.
08:13Who will make it to Saturn faster?
08:15Looks like one captain managed to take his spaceship there first.
08:19This selfie is supposed to prove it, but something feels off here.
08:23Can you see it?
08:32Saturn is famous for its rings and there are clearly no rings in the photo.
08:37The captain must have forgotten about it with his desire to win.
08:41Your spaceship's navigation system is fried and you need to get back to Earth.
08:46You find a map with three route options.
08:49Route A is the shortest path, but it takes you through an asteroid field.
08:52Route B is longer, but it orbits a black hole.
08:56Route C is the longest, but guaranteed safe.
09:00Which route should you take?
09:01Go for Route B.
09:11If you stay outside the event horizon and use the black hole's gravity to slingshot forward,
09:16you can travel much faster than the other routes.
09:19Your spaceship is losing power and you need to fix it fast.
09:23You find two wires.
09:25The red wire powers life support, but may cause an overload.
09:28The blue wire has an unknown function, but looks safe and undamaged.
09:33Which wire should you connect first?
09:35Go for the red wire.
09:36Without life support, you won't survive long enough to fix the engine.
09:48Once life support is working, you can carefully repair the other systems.
09:52It didn't work, so you need to escape, but the only way out is through one of three doors.
09:58Door one leads to a broken, gravity-free tunnel where you'll float endlessly.
10:03Door two leads to an airlock with no suit, meaning you won't last a second.
10:08Door three leads to a vacuum chamber with an emergency switch for gravity.
10:21Door number three is the one.
10:23If you can hold your breath for a few seconds,
10:25you can reach the gravity switch and escape before the vacuum pulls you out.
10:29Congrats! You've returned to Earth safely.
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