Answer:
1.- The universe comes into existence as a single point
2.- The first neutral atoms form
3.- Atomic nuclei form
4.- Hidrogen fuses into helium
5.- The universe is transparent
6.- Gases form that will later go on to shape the stars and galaxies.
Explanation:
1.- The universe comes into existence as a single point
Nothing existed before the moment in which the universe had been the dimension of a point with infinite density, known as space-time singularity. At this point all energy, matter, space and time are concentrated. Then, over an infinitely small time, an "inflationary force" appeared.
2.- The first neutral atoms form
The universe formed by subatomic particles are irradiated in large amounts of energy: photons.
When this pile of particles cooled down to millions of degrees, protons and neutrons formed.
3.- Atomic nuclei form
The electrons had a great energy and interacted with the neutrons, which initially had the same proportion as the protons, but because of those shocks the neutrons became more protons than electrons. At one point there were thirty-eight neutrons for every sixty and two protons.
The first thing that formed was the nucleus of deuterium, when the temperature of 3000 million degrees allowed the neutrons and protons to remain united.
4.-Hydrogen fused into helium:
thousands of years after the big bang the hydrogen and helium atoms were formed.
5.- The universe is transparent.
The charged particles interact with the photons so that the light can travel freely at the moment of creation, in that moment the Universe becomes transparent.
6. Gases form that will later go on to shape the stars and galaxies:
Around matter is formed; Nebulae, planets and stars. Shortly after the first galaxies are born.
