| A Chameleon Sky | ||
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| The sands of time are running out for the central star of this the Hourglass Nebula. With its nuclear fuel exhausted, this brief, spectacular, closing phase of a sun-like star's life occurs as its outer layers are ejected and its core becomes a cooling, fading white dwarf. In 1995, astronomers used the Hubble Space Telescope to make a series of images of planetary nebulae, including the one above. Here, delicate rings of colorful glowing gas (nitrogen-red, hydrogen-green, and oxygen-blue) outline the tenuous walls of the 'hourglass.' The unprecedented sharpness of Hubble's images revealed surprising details of the nebula ejection process and may resolve the outstanding mystery of the variety of complex shapes and symmetries of planetary nebulae. Image Credit: NASA, WFPC2, HST, R. Sahai and J. Trauger (JPL)... | ||
| 03 Sep 2010 | ||
| 800x600 | 1024x768 | Large |
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Extensions
Extensions
| Article Index |
|---|
| Extensions |
| Components |
| Modules |
| Plugins |
| Languages |
| All Pages |
Out of the box, Joomla! does a great job of managing the content needed to make your Web site sing. But for many people, the true power of Joomla! lies in the application framework that makes it possible for developers all around the world to create powerful add-ons that are called Extensions. An Extension is used to add capabilities to Joomla! that do not exist in the base core code. Here are just some examples of the hundreds of available Extensions:
- Dynamic form builders
- Business or organisational directories
- Document management
- Image and multimedia galleries
- E-commerce and shopping cart engines
- Forums and chat software
- Calendars
- E-mail newsletters
- Data collection and reporting tools
- Banner advertising systems
- Paid subscription services
- and many, many, more
You can find more examples over at our ever growing Joomla! Extensions Directory. Prepare to be amazed at the amount of exciting work produced by our active developer community!
A useful guide to the Extension site can be found at:
http://extensions.joomla.org/content/view/15/63/
Types of Extensions
There are five types of extensions:
- Components
- Modules
- Templates
- Plugins
- Languages
You can read more about the specifics of these using the links in the Article Index - a Table of Contents (yet another useful feature of Joomla!) - at the top right or by clicking on the Next link below.
Last Updated (Sunday, 22 November 2009 10:28)
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