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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

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

A black hole in our galaxy
All the existing galaxies, and our Milky Way too...

Read all the Curiosities

Related topics

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Compact objects
In the chapter on star evolution we said that both in white...
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Old Age
What happens when the main fuel is running out...
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multimedia


Space/Graphs and Tables
Recession velocity and distance

Space/Graphs and Tables
Dark matter