Cosmogony studies the origin of the universe and astrophysical systems. The Big Bang theory is the most prevalent cosmological model. Sean Carroll proposes two explanations for singularity origins. No theoretical model exists for early universe due to quantum gravity. String theory and loop quantum cosmology propose solutions
Universe began 13.8 billion years ago according to 2015 research. Planck epoch occurred at 10^-12 seconds, with no subatomic particles forming. Four fundamental forces emerged: gravitation, electromagnetic, weak, and strong. Universe expanded rapidly through inflation, reaching 10^78x volume
Medieval philosophers debated universe's finite or infinite past. Robert Grosseteste described universe's birth in 1225. Einstein's general relativity showed universe's expanding nature
Universe started as infinitely hot and dense singularity 13.7 billion years ago. Explosive expansion occurred in first second, faster than light speed. Universe contained fundamental particles like neutrons, electrons and protons. First visible light appeared 380,000 years after Big Bang
Universe is approximately 13.8 billion years old. Planck mission's data suggests 13.82 billion years. Atacama Cosmology Telescope measurement gives 13.77 billion years. Universe could be younger if expansion rate measurements are correct
Universe began as hot, dense point 13.7 billion years ago. Big Bang wasn't explosion, but space appeared everywhere. WMAP mission in 2001 confirmed universe's age. Universe expanded 90 times during inflation period