Amateur Astronomy Virtual Organizations

• Atlas of Nearby Stars  - Features an article that explains about parallax measurements and the Inverse Square Law. Also displays a collection of virtual experiments.
• Skyview Virtual Observatory  - Shows a research tool that provides pictures of any part of the sky at different distances. Also contains FAQs, articles and news updates.
• Virtual Amateur Astronomer  - Shows photos of deep sky and solar system objects. Also displays related links and glossary.