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Every lightcone contains infinitely many nearly complete, mutually exclusive, lightcones. This page looks at the maths of this, and its use as a cosmological model.
This fantastic site deals with cosmology : the study of the structure, history, and fate of the Universe. It's the place to go whether you want to know more about dark matter, how our universe formed ...
Will the universe go on expanding forever and what is the shape of the universe? Read how we are trying to find the answers to these questions.
The expanding universe is a complicated place. This video explains how faster galaxies can move faster than light and how we can see light from beyond our observational universe.
Stephen Hawking's Universe: explains some of the most important ideas and developments in human understanding of the universe. The Web pages include original essays in cosmology, original ...
A simple article from NASA which tries to show how big the Universe is and how long it would take to travel between stars!
If the solar system was the size of toilet cubicle how big would the universe be. Find out in this delightful animation.
Read how satellite observations of cosmic microwave background can tell us a lot about how the universe formed.
This interactive page allows you to explore the universe and how we measure size, from the incredibly small to the incomprehensibly big.
An animated guide to the origin of the universe from the BBC.
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