20 Questions
According to the Big Bang theory, when did space and time emerge together?
13.787±0.020 billion years ago
What is the approximate diameter of the observable universe?
93 billion light-years
Who developed the heliocentric model with the Sun at the center of the Solar System?
Nicolaus Copernicus
What did Isaac Newton build upon to develop the law of universal gravitation?
Copernicus's work and Kepler's laws of planetary motion
What is the approximate number of galaxies in the observable universe?
A few hundred billion
What is the overall distribution of galaxies in the universe at the largest scale?
Uniform and the same in all directions
According to the Big Bang theory, what is the most widely accepted model of the universe?
The Lambda-CDM model
What is dark matter?
Unseen matter that has not yet been detected directly
What is the percentage of ordinary ('baryonic') matter in the physical universe?
4.84%±0.1%
What is the prevailing model for the evolution of the universe?
The Big Bang theory
What were the first subatomic particles and simple atoms formed from?
Hydrogen and helium
What is the definition of the physical universe?
All of space and time and their contents
During which period of the universe's existence did the four fundamental forces separate?
Quark epoch
What is the process called when stable protons and neutrons form more complex atomic nuclei through nuclear fusion?
Photon epoch
What is the cosmic microwave background (CMB) made up of?
Photons released during recombination
What marked the end of the radiation-dominated era and the start of the matter-dominated era?
The formation of stars and galaxies
What is the ratio of the number of hydrogen to helium atoms in the universe?
25:75
What is the approximate duration of the Planck epoch?
10^-32 seconds
What is the name given to the period when the universe was still too hot for matter to form neutral atoms?
Photon epoch
What is the name of the process where ordinary matter formed large gas clouds, stars, and galaxies due to the attraction to concentrations of dark matter?
Gravitational collapse
Test your knowledge about the universe and the Big Bang theory with this quiz! Explore topics such as the development of the universe, the expansion since the Big Bang, and more. Put your cosmological understanding to the test and see how much you know about the vastness of space and time.
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