I find the last four words of this paragraph cringe-inducing. Not because they are wrong, but because the reporter/editor found them necessary:
Scientists mapped the Milky Way in a more detailed, three-dimensional way and found that it's 15 percent larger in breadth. More important, it's denser, with 50 percent more mass, which is like weight.
Really, when our nanny--a 26 year old high school graduate--can ask "if you stand on the south pole, do you fall off?" I really shouldn't be so surprised, but having to actually spell out that mass is like weight is simply pathetic.