The phrase "enough mass" refers to having a sufficient amount of matter or substance. It means having an appropriate or considerable quantity of something to fulfill a certain requirement or purpose. Full definition
In some states, large cities offer a large enough mass transit system that many residents do not feel that are required to own a auto by necessity. (carinsurancequote.net)
Both are some 100,000 light - years across, containing enough mass to make billions of stars. (earthsky.org)
And or never get enough mass or velocity in number of units to make this work. (biggerpockets.com)