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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.
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!
This interactive page allows you to explore the universe and how we measure size, from the incredibly small to the incomprehensibly big.
Read how satellite observations of cosmic microwave background can tell us a lot about how the universe formed.
An animation of the movement of galaxies as the universe expands.
Cool interactive where you compare objects in the universe to common items like cookies, beach balls and Brussels sprouts.
Wonderful resource about observing the universe through radio,infra-red, visible, ultra-violet and gamma-rays.
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