No matter how old you are, space never stops being cool. That applies doubly to black holes, which is why NASA's latest discovery should be considered totally awesome: using the Chandra X-ray observatory, the agency found an "unprecedented" cluster of black holes in the Andromeda galaxy. How unprecedented? There could be 26 of them in this cluster alone. And these were just the ones that were immediately identifiable, as scientists say there are likely many more that are currently invisible. Said the lead author of the study, "We think it's just the tip of the iceberg." Cool.