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Space

Introduction

Universe

Do you want a galaxy, ready to be served?
Here is the recipe you need:
Take  at least 100 billion stars and interstellar gas you desire. Add interstellar dust and dark matter, as required. Cook the mixture at a temperature of 1032K and do not forget the fundamental ingredient: gravity!
Leave it all to cool for at least a billion years... and ready! you have a galaxy that you can serve! It seems easy to create a new galaxy, but really we did not know what a galaxy was, until a very few time ago. In the past, we didn't have powerful observation instruments as today, so galaxies seemed small regions, placed everywhere in the skies and featured by a bright vagueness, called, exactly, nebulas.

Specials

Planck space telescope
...a new image of the infant Universe


Read all the Special Reports

More info

The cosmic microwave background radiation
In 1965, while studying the ground noise of a radio antenna...

Cosmic collision
When two galaxies start to approach, the tidal attraction forces deform their structures...

Read all the Curiosities

Related topics

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Old Age
What happens when the main fuel is running out...
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Star evolution
Stars are born, live and die like living beings...
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multimedia


Space/Photos
Quasar


Space/Graphs and Tables
Dark matter

Space/Graphs and Tables
Cosmic radiation