20.5 Evolution of the universe

• We only understand 5 percent of what makes up our universe.
• During the BB, time and space is created and the universe is a singularity; infinitely dense and hot.
• Atoms form after 380,000 years after the bigbang when the universe is cool enough for them.
• Our galaxy forms 200 million years after the big bang
• The solar system forms 9 billion years after the big bang
• Dark energy, is responsible for the acceleration of the expansion of the universe, it is estimated that this makes up 68 percent of our universe
• Astronomers studying the Doppler shift in light from distant galaxies found that the mass of the galaxy is not concentrated in the center, despite it visually appearing it; dark matter
• Dark matter isn't visible; can't be seen directly with telescopes and neither emits nor absorbs light.
• After the bigbang, the universe expands, the first fundamental particles gain mass, quarks combine to make hadrons, protons and neutrons, creation of matter then stops.