This item is a story saying that the Milky Way is bigger across and more dense than previously "thought" (it's not particularly clear on who thought this; I assume that the writer means "widely accepted by astronomers" - but that's not always the case).
The story contains the following: "More important, it's denser, with 50 percent more mass, which is like weight."
Why not just say mass? Why confuse it with weight, which has a different meaning?
Or if you must explain what mass is, why not take a further sentence to explain it in a way that isn't, well, wrong?