How much stuff is in a light-year?
Imagine taking the distance that light travels in an entire year. Now turn that distance into a cube, each side one light-year across. How much “stuff” would be in there? And how empty would it be? It all depends on where you put your massive cube. Top image: Messier 15, an ancient globular cluster. Even…
io9
Fraser Cain — Universe Today
Were Footballs Ever Really Made of Pigskin?
These days, footballs are typically made from cowhide or vulcanized rubber, making their nickname “pigskins” somewhat ironic. Football fans often perpetuate the idea that footballs used to be made of pigskin, which is how they got their nickname, but it turns out this isn’t the case. In fact, “pigskins” were originally made out of animal…
Tech News
Emily Upton - TodayIFoundOut.com