Exoplanet is an excellent IPAD application that covers extra solar planets. The data base is refreshed with new discoveries. The application covers 760 exoplanets now. Exoplanet allows correlation diagrams to be graphed showing such things as eccentricity to be graphed against mass. Graphing such parameters by hand would be very tedious but it can but done very quickly by the app. Correlation is a powerful tool and this is good example . Sincerely, Gary Vardon The book DO It Right will help you understand vital ideas leading to your greater success. GO to PublishAmerica.com Consulting For Profit is also available. Learn how to make money as a consultant.