Stages in the history of the Universe after the Big Bang. At 300,000 years, matter and radiation
decouple, and the Universe becomes transparent for the first time. The first galaxies form at around
300 million years after the Big Bang, but the exact time period is uncertain. At an age of 9 billion
years the Solar System formed. Finally, 13.7 billion years after the Big Bang we arrive at the
present day. The Universe is still expanding and evolving.