The Big Bang, the origin of the universe, was not an explosion at a single point, but rather an expansion that occurred everywhere at the same time. The universe began as an infinitely extended, infinitely dense point, and this singularity expanded rapidly. The universe is still expanding, with matter moving away from each other. The expansion is not a movement through space, but rather the expansion of space itself. This means that the universe is not getting bigger, but rather the space within it is increasing.
The Hubble sphere, the boundary beyond which objects move away from us faster than the speed of light, is also expanding. Eventually, the light from distant galaxies will no longer reach us, and astronomers will only see their own galaxy. The universe's expansion will continue to weaken the light from the Big Bang, and in the distant future, astronomers may only see their own galaxy and nothing else.
The universe is infinite, and its expansion is not a movement through space, but rather the expansion of space itself. This concept is difficult to understand, but it can be explained using the example of a hotel with an infinite number of rooms, where guests are moved to make room for new ones, but the hotel is not built anew.
1. Sir Fred Hoyle was a knight of the United Kingdom and the president of the Royal Astronomical Society.
2. Sir Fred Hoyle came up with the term "big bang".
3. The universe was born from a single point with a huge amount of energy.
4. The universe began expanding 13.8 billion years ago.
5. The universe is infinite and was also infinitely extended at the moment of the big bang.
6. The part of the universe that we can see now is about 93 billion light years in diameter.
7. The green circle on the diagram represents the visible part of the universe.
8. The universe expands from within, adding space inside itself and pushing matter away.
9. The expansion of the universe is not uniform, with some parts expanding faster than others.
10. The universe has a boundary beyond which objects move away from us faster than the speed of light, called the Hubble sphere.
11. The Hubble sphere is constantly increasing due to the expansion of space.
12. Galaxies are moving away from us, even faster than the Hubble sphere is expanding.
13. The cosmic microwave background radiation is a remnant of the big bang, and is 13.8 billion years old.
14. The universe may be rotating, based on the uneven distribution of the cosmic microwave background radiation.