The universe began with the Big Bang, and is estimated to be approximately 13.7 billion years old (plus or minus 130 million years). Astronomers calculated this figure by measuring the composition of matter and energy density in the universe, which enabled them to determine how fast the universe expanded in the past. As a result, researchers could turn back the hands of time and pinpoint when the Big Bang occurred. The time in between that explosion and now makes up the age of the universe.
the univers is getting bigger
The Universe's Growth Spurt Is Accelerating
The Universe Could Be Flat
The Universe Is Filled With Invisible
StuffThe Universe Has Echoes of Its Birth
There May Be More Universes
