The NASA Multi-Messenger Astrophysics Science Support Center (MOSSAIC)*

The era of multi-messenger astrophysics has arrived, leading to key new discoveries and revealing a need for coordination, collab-oration, and communication between world-wide communities using ground and space-based facilities. To fill these critical needs,NASA’s Goddard Space Flight Center and Marshall Space Flight Center are jointly proposing to establish a virtual Multi-MessengerAstrophysics Science Support Center that focuses entirely on community-directed services. In this article, we describe the baselineplan for the virtual Support Center which will position the community and NASA as an Agency to extract maximum science frommulti-messenger events, leading to new breakthroughs and fostering increased coordination and collaboration.