ReactOS is a cool project but ultimately pointless compared to the other free alternatives we have, with libre ecosystems.
ROS is built to be a drop in replacement for the Windows operating system, while retaining all other components of the system (like proprietary drivers, programs, etc).
I’m not an astronomer so I might be wrong, but wouldn’t the gravitational influence of stars from Andromeda in the Milky Way still be negligible, again because of much empty space there is?