Book 349

Preliminary: over the next decade the gravitational physics community will benefit from dramatic improvements in many technologies critical to the tests of gravity. The highly accurate deep space navigation, interplanetary laser communication, interferometry and metrology, high precision frequency standards, precise pointing and attitude control, together with the drag-free technologies will revolutionize the field of the experimental gravitational physics. The Centennial of general theory of relativity in 2015 will motivate significant number of experiments designed to test this theory to unprecedented accuracy. The purpose of this the contributions in this book is to explore possibilities for the next 20 years for conducting gravitational experiments in space that would utilize the new and also much improved existing capabilities.