A few minutes into the expansion of the big bang, the temperature was about a billion kelvins
The cosmic microwave background (CMB) is cold because the expansion of the universe has caused it to cool down over time, even though the early universe was very hot.
The early universe transitioned from being incredibly hot to its current lower temperature through a process called cosmic cooling. This involved the expansion of the universe, which caused it to cool down over time. As the universe expanded, the energy from the hot early universe spread out, leading to a decrease in temperature. Additionally, the formation of structures such as galaxies and stars also played a role in cooling down the universe by converting energy into light and heat.
its pretty hot right now. thats what she said.
The cosmic microwave background (CMB) originated from the hot, dense state of the early universe about 13.8 billion years ago. It is the afterglow of the Big Bang and provides crucial information about the early universe, such as its temperature, composition, and density fluctuations. This radiation helps scientists understand the evolution and structure of the universe.
Because there is a belief that the galaxies move away from you once you walk
gravity
The remnants of the big bang initially. Then the first stars formed.
None, the early universe was nearly homogeneous.
In the early universe there was only Hydrogen and Helium (and a smidgen of Lithium).
That means, the Universe in its early stages of development.
From most points of view the first thing to exist that would be recognisable by us would probably be light.
hot and dense. The cosmic background radiation provides evidence that in the early universe, all matter and energy were packed closely together and the temperatures were extremely high. This radiation is a remnant from the early stages of the universe's expansion and gives insight into its origins.