Our observable universe is 13.8 billion years old. It’s about 93 billion light years in diameter. It contains at least 200 billion galaxies and over 700 quintillion planets. As of now, over 4,300 exoplanets has been confirmed. They’re called exoplanets because they exist outside our solar system. At least 55 of them orbit in the habitable zone of other stars. Our Milky Way galaxy is 100,000 light-years across. That’s basically 946 quadrillion km (588 quadrillion mi).

The Milky Way galaxy contains up to 400 billion stars and anywhere between 100 to 200 billion planets. Our galaxy alone contains at least 6 billion Earth-like planets. These are planets that may have the right conditions to support the existence of life. With all these astonishing numbers of galaxies, starts and planets, do you still think we’re alone in the universe? Our solar system alone contains promising places where we could find alien life. The list includes Titan (Saturn’s largest moon), Enceladus (Saturn’s sixth-largest moon), Europa (Jupiter’s ocean moon) and Mars.