The Big Bang theory is supported by the observed expansion of the universe and the cosmic microwave background radiation. The universe's early moments involved a hot, dense state with the formation of ...

About 13.8 billion years ago, the entire cosmos consisted of a tiny, hot, dense ball of energy that suddenly exploded. That’s how everything began, according to the standard scientific story of the ...

Cosmic inflation tries to describe one brief but crucial phase in the Big Bang that launched the universe onto its expansion course. Credit: Christine Daniloff / MIT / ESA / Hubble / NASA Many ...

Within a month of the Big Bang, a second cosmic explosion may have given the universe its invisible dark matter, new research suggests. When you purchase through links on our site, we may earn an ...

Many textbooks and science educators have attempted to describe the Big Bang as the birth of the universe — an explosive start that happened at a specific point creating matter and flinging it into ...