Astrophysics and the formation of the universe

How old is the universe?

The universe is approximately 13.797 billion years old, based on measurements of the cosmic microwave background radiation and the expansion rate of the universe.

What is red shift?

Redshift refers to the phenomenon where light from distant celestial objects is shifted towards longer wavelengths, indicating that these objects are moving away from us. This effect provides evidence for the expansion of the universe.

What happened during the plank Epoch

The Planck Epoch was the earliest period of the universe, lasting from the Big Bang to about 10^{-43} seconds after, characterized by extreme temperatures and densities where known physics breaks down.

What are the four fundamental forces and there particles?

The four fundamental forces are gravitational, electromagnetic, strong nuclear, and weak nuclear forces. Each force has associated particles: gravitons for gravity, photons for electromagnetism, gluons for the strong force, and W and Z bosons for the weak force.

What happened during the grand unification Epoch

The Grand Unification Epoch occurred after the Planck Epoch, around 10^{-43} to about 10^{-36} seconds after the Big Bang, during which the strong nuclear, weak nuclear, and electromagnetic forces are believed to have unified into a single force. As the universe expanded and cooled, these forces separated, leading to the formation of distinct fundamental interactions.

What happened during the electroweak epoch?

The Electroweak Epoch took place from about 10^{-36} to 10^{-32} seconds after the Big Bang. During this period, the electromagnetic force and weak nuclear force are thought to have been unified, and as the universe continued to cool, symmetry breaking occurred, leading to the separation of these forces.

How did mass first come to be?

Mass is thought to have originated through the Higgs mechanism, which occurred when the universe cooled after the Big Bang. As particles interacted with the Higgs field, they acquired mass via their coupling to the Higgs boson.

What is the composition of the universe in ordinary matter, dark matter and dark energy?

The composition of the universe consists of approximately 5% ordinary matter, about 23% dark matter, and roughly 73% dark energy. Ordinary matter includes atoms and the elements that form stars, planets, and living organisms, while dark matter and dark energy drive the universe's expansion and structure.

What is primordial nucleosynthesis?

Primordial nucleosynthesis refers to the formation of light nuclides during the universe’s first seconds to minutes, when temperatures and densities were high enough for nuclear fusion.

What elements were created under primordial nucleosynthesis?

Hydrogen, Helium, Deuterium and minor amounts of Lithium.

In which epoch did the first normal matter form and why?

Quark Epoch, universe full of quarks, electrons and epochs.

During what epoch did the universe become visible and how?

Photon epoch, electrons were captured by the ionised nuclei to form more stable, neutral elements in a process called recombination. Once recombination had started photons could now move more freely without interacting with matter [photon decoupling] and the universe became transparent. Before recoupling the universe was opaque because photons would interact with charged particles, electrons and nuclei.

What were the cosmic dark ages?

380 thousand years to 150 million years. Between the creation of the first atoms and the first stars the universe had now ay of creating more light.

During which epoch was the fastest rate of growth of the universe?

Electroweak epoch, where the universe expanded faster than the speed of light.

What is Hubble’s law/constant and how is it measured?

Objects that are further away in space move away form each other at a greater rate as time increases. H0 = speed/distance and is the constant speed and distance that the universe is expanding at in any direction.

How did heavier elements form from stellar nucleosynthesis?

The heavier elements from stellar nu