• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • Whenever you search in PBworks or on the Web, Dokkio Sidebar (from the makers of PBworks) will run the same search in your Drive, Dropbox, OneDrive, Gmail, Slack, and browsed web pages. Now you can find what you're looking for wherever it lives. Try Dokkio Sidebar for free.



Page history last edited by Boris Ovetsky 13 years, 10 months ago

  This site was created for Central High School of Philadelphia Astronomy Honors class.  It is used for students' projects and presentations.

News and articles 




Are you curious about dark matter and dark energy in our Universe?  Want to know more about it?  Here is the article published in arXiv on January 21, 2009.  It gives a review of the development of the concept of dark matter from the moment it was introduced until today.

Ok, dark matter.  How about dark comets?  And a new theory of Tunguska event?  Intrigued?  Read this article.





Fliqz has shut down their service. To access this video, email support with this video id: abf6fa3ca3d54d14b94f1b6a45b53005


This QuickMovie is created using my pictures of Stonehenge taken in 2007





Comments (2)

Anonymous said

at 1:02 pm on Oct 14, 2008

i like the stonehenge picture

Anonymous said

at 1:02 pm on Oct 14, 2008

I wish there was a picture for the home page.

You don't have permission to comment on this page.