The Big Bang
Timeline of the Universe: The Big Bang to the present
The most powerful explosion on Earth
From Big Bang to Sunshine: The First Stars
Supernova: life cycle of a star
Chapter 3
Falling
Galactic cannibals
Einstein’s Theory of General Relativity
Chapter 4
Destiny
The life cycle of the Universe
Searchable Terms
Picture credits
Acknowledgements
About the Author
Credits
INTRODUCTION
THE UNIVERSE
At 13.7 billion years old, 45 billion light years across and filled with 100 billion galaxies – each containing hundreds of billions of stars – the Universe as revealed by modern science is humbling in scale and dazzling in beauty. But, paradoxically, as our knowledge of the Universe has expanded, so the division between us and the cosmos has melted away. The Universe may turn out to be infinite in extent and full of alien worlds beyond imagination, but current scientific thinking suggests that we need it all in order to exist. Without the stars, there would be no ingredients to build us; without the Universe’s great age, there would be no time for the stars to perform their alchemy. The Universe cannot be old without being vast; there may be no waste or redundancy in this potentially infinite arena if there are to be observers present to gaze upon its wonders.
The
