  This article is a foreword for the special issue on Gravitational Wave
Detection and Fundamental Physics in Space for International Journal of Physics
D. In the foreword, we review briefly the history of the development of mission
concepts and projects for the gravitational wave detection in space together
with fundamental physics missions. We summarize briefly the gravitational-wave
detection-in-space science goals and the current progress in the experimental &
technological developments presented in the articles of this special issue, and
list the articles with publication information and arXiv numbers.
