Why is the universe flat?

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1. You speak like you know so much but you don't even know the truth.
2. I'm sorry but that didn't help me at all. How could you possibly compress all the matter in the universe to the size of a billionth of a proton, and if you could, how long could it exist like that and when did it decide to invent negative gravity? Where did all the matter come from anyway?
3. well, whatever... she's not that flat.
4. every thing has starter i mean start point to start from , what is the start point of energy and what cuase the universe to be a a life , im sorry my english is weak but i hope u get my question...^_^thanks for this beatefull vedios
5. ===Theories more and more absurd. It's called self brainwashing. Check Cosmic Microwave Background.
6. Hello Physics Girl I really like your videos and teaching. I just learned about your videos and teachings a few weeks ago. Thank you very much. Have you ever though about making a video on the flat earth verses the Spherical earth? I have a lot of friends who believe the earth is flat and know matter how I try to prove to them the earth is not flat. They still believe the earth is flat. Any way Thank you Merry Christmas and happy new year I wish you all the best in your life and future studies.
7. Sabrina... The answer... You can actually travel all the way back to the Big Bang... Self Evident Learning... The good news for the human race is here!
8. assuming if you will a closed universe , will there not be infinite areas of collapse because much of the universe would have expanded so far that effectively it could not `communicate` with all itself ?
   Also how do we know the universe is the same temperature outside of the observable universe ?
   In the beginning ,when you say it was a billionth the size of a proton ,wouldn't the `measuring ruler `inside this be also shrunk so the universe would appear the same size ?
9. it's not
10. I am so in love 💞. Don't stop talking 💎💍
11. because of my very limited download quota, i usually watch youtube in 360p. This one time though, i had to watch it in 720p, maximum resolution possible
12. The video says everything in our observable universe spread out in a period of 13.8 billion years, but there are galaxies in our observable universe with a diameter of 1-2 billion light years wide. Does that mean things travelled faster than the speed of light during the inflation ?
13. I understand that the big bang theory tells us that the universe began in a tiny point a finite time ago. I also hear that the universe is infinite. These two ideas seem to be contradictory to me. How can this be reconciled? Does the big bang require an absolute beginning to time? If the universe is not infinite what is its boundary like?
14. Try putting subs to your video it helps for better understanding as u speak about many scientific things
15. Its easy, its got to do
    with euclidean geometry if the universe is flat it all works out (all triangles stay 180) if not and the universe is non euclidean
    and the math don't match and every thing we know about the universe is wrong so they have to say its flat.
    Plus to stay with conservation of energy because if its curved it will have plus energy or positive energy.
    Also if its curved there would not be no straight lines(as such) and plus where is the account of dark matter in all this since its 85% of the entire universe. How presumptuous of us humans to understand the "WHOLE UNIVERSE" where we haven't even left our own solar system or our own planet in over 50 years and established flight just over 100 years ago.
    It all could be optical illusions as to how the universe works until we get out there if we ever do.
    Tell me what an apple taste like without taste it.
16. Great series. Thank you for doing these. The more people we get involved, and women have been forced out for too long, the quicker we will figure it out. Even if women think about things differently, actually especially if women think about things differently, we all the input we all can get. Bravo to shows like this.
17. Why use the term "flat" when what is meant is uniform? It's a "uniform universe", the same throughout its structure and composition.
18. A few times the video states that the volume of the universe is expanding (ΔV > 0), while the density remains the same (ΔD = 0). Defining mass as M, density as D, and volume as V; if D=M/V, as volume increases but density stays the same, that would mean that mass is increasing (ΔM > 0). If we are adding more mass to the universe, doesn't that violate the law that matter can be neither created nor destroyed?
    
    Thanks!
19. ⭐OUR SOLAR SYSTEM LOOKS LIKE A FLAT FLOATING RING INSIDE THE SPACE OF OUR GALAXY.
    ⭐ OUR GALAXY LOOKS LIKE A FLAT FLOATING RING INSIDE THE SPACE OF OUR UNIVERSE!
    ⭐ OUR UNIVERSE LOOKS LIKE A FLAT FLOATING RING INSIDE THE SPACE OF THE 1ST HEAVEN ?
20. NDT is way hotter...