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,
00:10you 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?
00:22How many satellites does Mars have?
00:31The code is 8-3-2.
00:35There 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,
00:47one 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.
01:01An 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.
01:21Oh no! Two 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.
01:40The tethered astronaut will reach the ship first.
01:43They can pull themselves along the rope, controlling their movement and speed.
01:47The untethered astronaut can't move independently unless they push off something.
01:52If they do push off, they will move toward the ship
01:55but won't be able to adjust their trajectory or speed.
01:59Two female astronauts on the orbital station seem suspicious.
02:03One is always smiling and pretends to act normal.
02:06The other one who is also smiling but always keeping her hands in her pockets.
02:11Which of them isn't human?
02:14The correct answer is the blonde astronaut.
02:17The edge of green fur right here is a clear clue.
02:21She hides her furry ears and wears a space suit even inside the station
02:25so as not to give away her true nature.
02:28Astronauts on board the ISS complete an orbit of Earth every 90 minutes.
02:34They move from the bright side into the shadow.
02:38So how many sunrises and sunsets do they see every Earth day?
02:52Sixteen times! You just need to divide 24 by 1.5.
02:57You're on a spacewalk to repair a satellite.
03:00But a satellite is not a satellite.
03:04You're on a spacewalk to repair a satellite.
03:07But a sudden bang throws you away from the ship.
03:10Your maneuvering system is out of order.
03:12How will you get back?
03:14You can wait for help, staying still.
03:17You can try to move your arms and legs, trying to swim back.
03:20Or you can drop one of the tools and push off from it.
03:25There's no air in space, so flapping your arms is useless.
03:29But throwing a heavy object in the opposite direction
03:32will give you momentum in the right direction.
03:35You are an astronaut on a damaged spaceship,
03:38and your navigation system is down.
03:41The only clue left is a message from an unknown intelligence.
03:45Your mission control tells you that you're on the wrong ship.
03:49This 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?
04:09It's Mercury!
04:11You receive an alert.
04:13A giant asteroid, 7 miles wide, is hurtling towards Earth.
04:17A scientist suggests, let's launch a satellite to orbit the asteroid
04:21and use solar sails to gradually alter its trajectory.
04:25A mechanic says, let's attach thrusters to the asteroid
04:28to nudge it off course over time.
04:31An astronaut offers to send a spacecraft with gravitational tractors
04:35to tow the asteroid away from Earth's path.
04:38Which course of action will you choose?
04:48Listen to the scientist.
04:51Using solar sails or reflective paint can change the asteroid's trajectory
04:55through the Yarkovsky effect,
04:57gradually 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.
05:11And the third one simply laughed.
05:13Which is the best place to go?
05:17The silent nod is the most universal gesture of agreement,
05:21so it's probably the safest option.
05:24A quick hand gesture can be either a greeting or a warning,
05:27and laughter without an explanation could mean some unpredictable civilization.
05:32There are three black holes in front of your ship.
05:35A small one, a large one, and a giant one.
05:38All of them suck in light and matter,
05:41but only one of them is a problem.
05:44All of them suck in light and matter, but 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,
06:02passing through its center.
06:04The small black hole is spinning so rapidly,
06:07its gravity will tear apart even light.
06:10The larger black hole is almost motionless,
06:13like 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?
06:32They 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
06:46that could wake up at any moment.
06:49Suddenly 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.
07:00Fire your engines at full power and try to fly straight away from the black hole.
07:05Use your thrusters to move sideways,
07:08trying to orbit around it and slingshot away.
07:11Eject 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.
07:35Your oxygen tank is leaking and you have only ten minutes of air left.
07:40You 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.
08:01That 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?
08:25Saturn 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.
08:53Route B is longer, but it orbits a black hole.
08:56Route C is the longest, but guaranteed safe.
09:00Which route should you take?
09:09Go 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.
09:29The blue wire has an unknown function, but looks safe and undamaged.
09:33Which wire should you connect first?
09:43Go for the red wire.
09:45Without 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.
09:53It didn't work, so you need to escape, but the only way out is through one of three doors.
09:58Door 1 leads to a broken, gravity-free tunnel where you'll float endlessly.
10:03Door 2 leads to an airlock with no suit, meaning you won't last a second.
10:08Door 3 leads to a vacuum chamber with an emergency switch for gravity.
10:19Door number 3 is the one.
10:22If 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!
10:33That's it for today.
10:34So, hey, if you pacified your curiosity, then give the video a like and share it with your friends.
10:39Or if you want more, just click on these videos and stay on the Bright Side!
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