The origin of the universe

Question 1: How old is our universe?

13,7 - 13,8 billion years

Question 2: What does the big bang theory claim and what discoveries led to finding and proving the big bang theory?

• Big Bang theory:

The universe was created from a single-point explosion. from this point, the matter in our universe has been catapulted in all directions. this movement is still audible and visible.

• Einstein:

Light bends, so he was able to calculate the exact location of all the stars and he noticed that the universe is expanding.

• Lemaitre:

He was called Mr. Big Bang

• Hubble:

By measuring the Doppler effect of stars, he noticed that distant stars have a redder shift, so they move faster. proof that the universe is expanding

Pensias & Wilson:

They recorded the background noise with their radio telescope.

Question 3: What is the Doppler effect?

relative motion between transmitter and receiver causes waves to stretch (when moving) or contract (when moving towards each other). The wave is said to be shifting. The greater this relative motion, the greater this shift in wavelength. so if you measure the shift of the wavelength, you can measure the velocity of that object opposite you and see if it's moving away or towards you.

Question 4: What happened 380000 years after the big bang?

About 380 thousand years after the big bang, the universe has cooled down to such an extent that electrons and protons can form hydrogen atoms together.