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by Hunter Rey1 view·Updated Apr 14, 2022
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  1. the variation in the size of the universe since the Big bang.
  2. What is the Big bang?
  3. The Big Bang is how astronomers explained the way of the universe began.
  4. It is the idea that the universe began as just a single point,
  5. then expanded and stretched to grow as large as it is right now
  6. and it is still stretching.
  7. The Big Bang is said to be the start of the universe.
  8. As it occurred some 13.8 billion years ago
  9. all the Galaxies, stars and planets were connected concentrated
  10. into this tiny point
  11. and it was smaller than the nucleus of an atom.
  12. The first atoms are thought to have formed
  13. when the universe was around 400,000 years old.
  14. The first stars swaddled into life. Cosmologists believed
  15. About 250 million years after the Big Bang
  16. as the first Galaxies, Galaxies. Shortly after that,
  17. What is the difference between the size of the universe before the Big Bang? And now,
  18. as I've said before, the unit
  19. Said before
  20. the universe
  21. is was the size of the nucleus of an atom.
  22. So very very, very small.
  23. Today,
  24. 13.8 billion years after the Big Bang.
  25. Its size is 46.1 light years billion light years in radius in all directions.
  26. So the universe is expanding, However, is it's still expanding
  27. and is it speeding up or slowing down?
  28. The universe has not expanded from anyone spot since the Big Bang?
  29. Rather, space itself has been stretching and carrying matter with it.
  30. This is called dark energy and it's what
  31. scientists believe is the cause of the this expansion
  32. and why is it why it's still expanding today,
  33. observations shown that the expansion of the universe is accelerating,
  34. shuts out the velocity at which a
  35. distance galaxy recedes from the observer is continuously
  36. continuously
  37. increasing. With time.
  38. We've even measured the rate precisely well
  39. and it can be certain
  40. from all measurements and observations that we've taken
  41. that the present day rate of expansion is precisely between 66 and 74 km/s
  42. per
  43. MPC
  44. kilometers per second per mega parsecs.
  45. A mega parsecs is one million parsecs
  46. and the definition of that is a unit of measure for
  47. distance in an intergalactic space equal to one million parsecs.
  48. Here is my model I have created for the expanding universe
  49. and when the balloon is inflated,
  50. its surface area increases, and so do the dots on the surface
  51. which represent the Galaxies
  52. and that they moved further apart.
  53. However, the Galaxies do not increase in size.
  54. For example,
  55. the Milky Way is in expanding just the length between the other Galaxies.
  56. So when it inflates
  57. the distance between two between Galaxies increases,
  58. but not to the actual galaxy itself.
  59. So that's the end of my video.
  60. Thank you for listening