The video explores the vastness of the universe, starting from the Milky Way and gradually increasing the scale. It emphasizes the immense size of the universe, which is much bigger than the Milky Way. The video mentions that the Milky Way is 100,000 light years in diameter and about 25,000 light years from the center.
The video then introduces the concept of the local group of galaxies, which includes the Milky Way and its satellite galaxies. It highlights the Andromeda galaxy, which is the closest to our Milky Way and is coming towards us. The video also explains that the light we see from Andromeda today took 2.5 million years to reach us, meaning we are seeing it as it was 2.5 million years ago.
The video then introduces the Virgo Supercluster, which includes our local group of galaxies. It shows how our local group and the Virgo Supercluster are minuscule in comparison to the larger structures of the universe.
Finally, the video discusses the observable universe, which is the maximum distance from which we can see due to the time light takes to travel. It explains that each point in the observable universe likely represents a supercluster of galaxies, with each supercluster containing millions of galaxies. The video concludes by stating that we are at the center of the observable universe and that each person has their own observable universe.
1. The speaker discusses the Milky Way, which is located about 25,000 light years from the center of our galaxy. It is 100,000 light years in diameter and about 1,000 light years thick.
2. The Milky Way is part of a local group of galaxies, which includes the Andromeda galaxy. The closest galaxy to ours is the Andromeda galaxy, which is coming towards us and will collide with the Milky Way in the future.
3. The speaker notes that the light that came from Andromeda, which reached us until now, took 2.5 million years to reach us. This means we are seeing the Andromeda galaxy as it was 2.5 million years ago.
4. The speaker mentions that the Milky Way is estimated to have around 400 billion stars, while the Andromeda galaxy is estimated to have around 1 trillion stars.
5. The speaker discusses the Virgo Supercluster, a larger structure that includes our local group of galaxies. It is mentioned that if every star houses a planet, there could be many civilizations studying our galaxy, the Milky Way.
6. The speaker notes that our local group of galaxies is within a supercluster of galaxies, which is called the Virgo Supercluster. There are superclusters of superclusters, and each point in the image represents a group of galaxies.
7. The speaker discusses the observable Universe, which is a sphere with a radius of 13.7 billion light years. We are at the center of the observable Universe.
8. The speaker mentions that the light that came from an object on the edge of the observable Universe took 13.7 billion years to reach us, which is almost the age of the Universe. This means we are looking almost at the beginning of the Universe when we look at an object on the edge of the observable Universe.
9. The speaker notes that we don't know what exists beyond the observable Universe because light simply hasn't reached us yet. This implies that there could be more observable Universes beyond what we can currently observe.
10. The speaker concludes that for each person, there is a different observable Universe. This means that the observable Universe varies depending on one's location in the Universe.