We know the events from the Big Bang until now. Let's get a feel for when they occurred. Let's imagine that the age of the universe is 1 year old. Place the following events into the calendar:

• The Milky Way forms
• Our Solar System forms
• The first signs of life on Earth
• Dinosaurs are extinct
• Modern humans evolve
• Recorded history begins
• Columbus arrives in America

Ready to see how you did? Click here for the answers and an explanation of this "Cosmic Calendar".