The Big Bang:a theory in astronomy: the universe originated billions of years ago in an explosion from a single point of nearly infinite energy density —
Big Bang Evidence
Space Flight Gravity Interactive
The known universe is made up of 50,000,000,000 galaxies. There are between 100,000,000,000 and 1,000,000,000,000 stars in a normal galaxy. In the Milky Way alone there might be as many 100 billion Earth-like planets. Still think we’re alone?