Big bang theory Flashcards
14 billion years ago
The universe bagan, the singularity wich contained all the universe started to expand.
In the first second
Neutrons, protons and electrons began to form. the universe began to cool down after the “bang”. TThe singularity kept on expanding.
After three seconds
Protons and neutrrons combined, it had already become colder after the big bang.
After ~300 000 years
The electrons finally started to slow down as the temerature dropped even more. Now that the electrons had slowed down they combined with the neutrons and protons creating the first atoms, helium and hydrogen.
After ~1 billion years
The first stars and galaxies were formed by the helium and hydrogen atoms.
After ~13 billion years
The first dying stars create heavy elements wich turns into new planets or stars.