SCIENCE CLASS #3- Why is the Sky Blue?

Mark Rober

1,1 млн переглядів117

    Let's get a better mental model beyond just "because blue light scatters more". I stream science LIVE M-W-F 1pm PT.
    Here is Sally's channel!! She is live streaming a series on evolutionary biology-
    BOSE will be sending out 8 pairs of their dope 700 headphones. 4 will go to people who post about our class on Insta, Twitter, FB or TikTok. 4 will go to my favorite challenge responses or answers to questions. You can post your challenges by tagging me on any social media platform.

    Опубліковано 10 місяців тому


    1. Chupacabra

      im blind though.... jk ;)


      Can't u start these series again

      1. PARAM SHAH

        Plz do it

    3. TobiTechBoy

      Hi mark! Needed to watch this from school lol 😂

    4. Laura Alagia


    5. HACKERISTIC 499

      Q : If we pass a white light through a prism will it break into infra-red and ultra-voilet rays?

    6. minecraft dj Alex

      oh i took this class haha

    7. minecraft dj Alex

      i missed a lot of classes

    8. Ben

      F for plant

    9. Berlin Greek

      That was so f*** awesome! Its often really fascinating what the rules are and how the World works! Thanks for doing these videos!

      1. Berlin Greek

        @Joe Mama He is a science-freak indeed! YEAH SCIENCE!

      2. Joe Mama

        The freak

    10. Tewan

      The interlacing man

    11. Aurel

      1:56 the moment i realized what he was referring to. it is literally so unnoticable.

    12. Kamalesh S

      dip your hand in oil then put in water

    13. Vedant Katira

      Does transparent stuff absorb light or reflect ? Hmm for example plastic sheet, I think light will go through it . Will it reflect or absorb ? Mark ?

    14. Not Toby


    15. Pavan Meka

      F for my plant

    16. Most interesting man in the hood

      Blue sky = Water outside of dome firmament.

      1. Most interesting man in the hood

        @positive Vibrations Exactly. Their "proof" has been disected, torn to shreds, and proven false so bad that they wiped the mainstream internet clean of the topic and even removed all related educational content on YT in 2017 and replaced them all with joke/prank videos. Very strange move for something labeled as a silly conspiracy theory. I mean why not also remove all the UFO, bigfoot, and lochness monster videos too right?

      2. positive Vibrations

        Facts nobodies ever been to space

    17. Wrapped Goods

      The blueness on the world globe, is the sky ;)

    18. yeet yeet yay O,Brien

      is the sky blue because the sun reflects blue rase from the sky

    19. Nick Considine

      This was so awesome, thank you SO much Mark!! You're legitimately a great teacher, I just made my sister and mom watch this with me and they loved it too. Keep doing this, I think it's really good for the world.

    20. Alyssa Epstein


    21. William Fuentes

      14:37 was that a voice crack

    22. papyurs9RBLX

      All he said was lies, it was obviously a gender reveal that made the sky blue

    23. b r u h

      well THIS is gonna make high school physics easier idk i've never been in high school

    24. デッド。

      corona rating science teacher man: 0/10 me: 108409284093809859043805803280850/ 10

    25. Parker Carlson

      3:28 "We'll just get right into it" Is that ironic?

    26. Obaidullah Ahmad

      apparently, the buoyancy thing is not that hard lol

    27. KINGCOW

      Did u notice the voice crack

    28. Irene Anousaki

      OK Google... Count down 8 min... 😁

    29. Charles Torres

      not true

    30. Atėnė Er.

      In germany sundets are like coton candy (blue and pink)

    31. Rheeza !

      I think he really needed to go to the toilet towards the end

    32. LilieKatrina_moved

      I just wish that mark rober can be my science teacher-

    33. Doctors_TARDIS

      I'm a grown adult, I knew every bit of this going in, and I was still highly entertained.

    34. Brendan Passarell

      The divergent straw statistically guarantee because ferryboat undoubtedly saw an a anxious bit. efficacious, standing april

    35. HANO ROAM

      wow.this is great

    36. *?Questions?*

      He seems very akward lol

    37. David Wheeler

      Wow that’s cool

    38. Chris Hoops

      9:50 can we admire that sound affect and how perfect it was lol

    39. Daniel Beatty

      After watching this, I'm wondering how does bleach work?

    40. Daniel Beatty

      This has been great. Appreciate your enthisiasm too. Learned so much.

    41. Bladesbry

      mark i came across your videos an i have a important question to ask you about this video would the electromagneitc waves be the same for a colour blind person or would it be different

    42. Anthony He

      Green has left the chat

    43. 7The cool cat7

      I thought the water reflects on the sky or the other way round

    44. boss master

      why is water wet

    45. Joshua Spice-Araujo


    46. Me

      Cool videos

    47. ZƎRØ

      because god loves the infantry

    48. Charlie Lambourne

      R.I.P my plant

    49. t w

      Mark look so nervous. Lol

    50. Darrel Collins

      Why is the sky not violet?

    51. Rushikesh Karle

      I thought that science is lousing intrest but it is true which we all know that the teacher is not cool like mark

    52. Josh the Flat Earth Jedi

      Nobel gases is the reason for all the different colors of the sky. God created such an amazing beautiful flat stationary earth!

      1. Josh the Flat Earth Jedi

        Also the firmament above holds back the waters. Meaning what weve been told is space is actually water and nobody is going there.

    53. Anna Young_26

      i will not mind if he is my physics teacher

    54. Anna Young_26

      i want to work at nasa because of mark that is the ony reason i get good grades

    55. JDM _King15


    56. Jazz Stew

      Mark Rober, to me, always seemed like one of the coolest dudes on UKup. I forgot that someone who worked at NASA must've been a nerd. Love seeing this passion

    57. Rob H

      In order to see the reds well, make sure you use an old incandescent flashlight. If you use a modern LED flashlight, pick one with a high CRI and R9 value.

    58. Isaacsal0

      he needs to do more of these

    59. Aarsh Chokshi

      Mark would be the coolest teacher in school

    60. Brijinder S D singh

      Ithought of kids said because I love you ha hanot to worry

    61. Universe Floofball

      If Mark was my science teacher I would actually like the classes

    62. Sherard Hall

      but seriously why would anyone give this video a thumbs down? and then 505 dislikes, why? Mark you are the man! Great video again, subscribed!

    63. Ondrej Hrdy

      What does it mean that the particles resonate with other particles?

    64. Ernesto Noiran

      Mark's videos are great, building every kind of device, testing, teaching.

    65. Christi Elmore

      I,m thinking all water reflects on 🌎 earth

    66. King Manta

      I had a better understanding about this concept prior to your video..

    67. Discus Channel

      Mark you areee sooooooo goooddd at presantions

    68. Maddix

      So if the nitrogen and oxygen like blue the most why aren’t they the ones instantly absorbed and instead reflected and showed to us?

    69. Daniel Kruger

      @sally dont put your hand in the water to get wet

    70. Durant Gilleland

      I thing he needs a intro with a song added like if you agree

    71. R. Vergara


    72. Tech Ethan

      Mark is the dream science teacher

    73. Slowcloud Orca

      Had to stop watching.. I loved the squirrel video....

    74. Slowcloud Orca

      Everyone else sees the sun as yellow right? Mark.... I know what you meant. I guess... but most people see the sun as yellow.. sorry but let's ask the crowd to establish a majority, rather than making a statement.. and quickly moving on glossing over what you said.

    75. Slowcloud Orca

      So the story and song really ought to be ... rudolph the ultraviolet nosed reindeer .... ?

    76. J FO

      Mark, it's called and Erlenmeyer Flask

    77. NEERAJ K.R

      Actually violet has shorter wavelength . Imagine if the sky was violet

    78. ItzEclipse

      I need him as my science teacher

    79. no u trash

      ohhhh so thats why light is orange when i put the torch light through my hand

    80. Brady Fabin


    81. Kaitlyn Grumeretz

      Lol, I am watching this on a saturday.

    82. Duane McClure

      Ya know what? You just proved every flat earther wrong in one fell swoop! If the earth was flat, the sun's color wouldn't change at all. It would simply move farther into the distance but it's intensity would remain. The sunset proves that the sun is in an arch! I still believe it's God created because there still needed to be thought behind it's beauty. Science doesn't cancel out God's existence. It proves it.

    83. Lego freak Azlan

      I don’t know why but u are in nasa but u want to be physics teacher like why mark rober u are awesome with nasa

    84. Lego freak Azlan

      This is really exciting

    85. Levi Bonner

      mark im subscribed

    86. Angelica Chavez

      How do rainbows form

    87. Angelica Chavez

      Mark should answer why are peoples hair a diffrent color.🤔

    88. NicoOfficial

      The 504 people who disliked this are people who think the sky is green.

    89. Royal king Rblx

      Every mum and dad:whos that he wont teach u anything go to school for once rather than watching ur phone. Me:he teaches good stuff u know he has 14 million subscribers. Mum and dad:what are those even if it was that much there are 7 billion ppl in the world

    90. Evan Vondra

      Because God loves the infantry. ⛩🇺🇲

    91. Leah Dahlback

      *Me looking in the corner* sees metal flying poles HuH

    92. The Saturday Project

      "the photons are here look out your window" *looks out of window although i know its night*

    93. 3d

      i understand nothing with ur normal vids but with science class i understand the science

    94. Franz Pattison

      so the sky is blue because the smaller wavelengths are being scattered by nitrogen? but I thought the scattering of light waves is what causes them to disperse and become less visually perceptible, like how a flashlight appears to become dimmer over distance but it's just because the light is being scattered by the air molecules. So if the blue light is being scattered by the nitrogen molecules, doesn't that mean we *wouldn't* see them, so the sky *wouldn't* be blue? kind of like how you were describing how sunset works, because the blue light is scattered and loses focus. im confused. *EDIT* Or, maybe it's not that the nitrogen disperses the light, but simply that it behaves like a selective prism, diverging the blue light from the white light, so that's why we see it?

    95. commander J science

      Good question"

    96. Mona Ni

      Ever since my first high school physics class, I’ve been excited for the day one of my unsuspecting future kids might ask this question. Now I have a lesson plan. Thanks, Mark!

    97. Mrs Wray

      Anyone else’s sound cut out around 9 minutes?

    98. Green Goo

      I’d rather watch this than do school

    99. Anurag Khandekar

      CV RAMAN had this question first i think.....................

    100. Johnd116

      I’m at 50 seconds and I think it’s because there are like water in the clouds or raining and it reflects blue light