MFB: Mid-Frequency-Band Space Gravitational Wave Observer for the 2020 Decade

A Mid-Frequency-Band (MFB) gravitational wave observatory in geosynchronous orbit (73,000 km), optimized for the frequency 10 mHz to 1 Hz. MFB that bridges the science between the ground observatories LIGO /VIRGO (4/3 km - and planned ones 10/40 km) and the milli-hertz band of LISA (2.5 Gm) — with usable sensitivity extending to 10 Hz.