Since the Hubble Space Telescope was launched, it has been discovered that there are 10-50 billion galaxies in space. Each galaxy contains between 50 and 100 million stars and an unknown number of planets.
Letters and stars
If you built a bookshelf from the ground to the sun, 1000 stories high, and filled it with books, the number of letters would equal the number of stars we know today.
The biggest explosion since the Big Bang
The biggest explosion in the universe since the Big Bang occurred in a galaxy 12 billion light years away. The explosion was so violent that for one second, the galaxy emitted as much energy as all the stars in the entire universe.