There is a current space experiment to measure the behavior of two elisa nodes. They are only a foot apart instead of a planned million kilometers. The purpose

There is a current space experiment to measure the behavior of two elisa nodes. They are only a foot apart instead of a planned million kilometers. The purpose is a low cost in situ test of instruments. And also to survey the types of in situ instrumental and evironmental noise. It took decades to reduce LIGO noise to acceptable levels.