From site:  Zoom Astronomy is a comprehensive on-line site about space and astronomy. It is designed for people of all ages and levels of comprehension. It has an easy-to-use structure that allows readers to start at a basic level on each topic and then to progress to much more advanced information as desired, simply by clicking on links.

AllAboutSpace.com (Zoom Astronomy) also includes printables, activities and worksheets.

Earth & Sky offers three valuable features on their space pages.  The first is a series of up-to-date downloadable podcasts on planets, the solar system, space exploration and astronomy.  The second feature is a daily chart of the night sky as seen from the northeast US.  The third feature is an “Ask the Scientist” section with answers to questions commonly asked by both kids and adults.

From site:  Nearly 400 years after Galileo first observed the heavens through a telescope, we continue to seek answers to age-old questions about the universe. And while the technology has evolved over the centuries, the inquiry remains essentially the same: What’s out there, where did it come from, and what does it mean?

At the Space Telescope Science Institute, we’re working hard to study and explain the once-unimaginable celestial phenomena now made visible using Hubble’s cutting-edge technology. In the course of this exploration we will continue to share with you the grace and beauty of the universe. because the discoveries belong to all of us…

The universe holds many mysteries. Explore some of the marvels that lie within our cosmic neighborhood and beyond.

Latest news and information about astronomy and space exploration in magazine-style format. The Skywatching section has helpful guidance on phenomena in the night sky, when to look and where to look.

Track what’s happening on current and scheduled space missions in the SpaceFlight section.  In other sections, you’ll find info on space-related TV shows and movies, and can see lots of great videos and pictures of objects in space.

From site:  The Nine Planets is a collection of information about our Solar System intended for a general audience with little technical background. No special expertise or knowledge is needed; all technical and astronomical terms and proper names are defined in the glossary. The bulk of this material should be familiar to planetary scientists and astronomers but they may find a few interesting tidbits, too.

This site consists of about 100 pages, one page for each major body in the Solar System. Each page has:

• a large picture of its object and usually several smaller thumbnail images (all linked to their full-size originals)
  
• some scientific and historical facts about it,
  satellites then its page has a table of data on them and links to their pages,
  
• links to more images and information about the object elsewhere on the Web, and
  
• a list of open issues for which we as yet have no answers.

To truly justify the title of “Multimedia Tour”, I’ve also included:

• short sound clips from Holst’s The Planets (about 10 seconds or 180k each) for seven of the planets;
  
• sound clips of my mellifluous voice pronouncing some of the more unusual names;
  
• links to “movies” of a few objects.

There are also a few miscellaneous pages: on planetary science spacecraft, the glossary, a list of some of the planetary images available elsewhere on the Net, some bits of history, several pages of data and a special plea for your support of the space program.