There's so many cool things to see out in space — from gorgeous views of Jupiter to stunning glimpses of Saturn, and a star that might have aliens hanging out nearby — that it's easy to forget that it's actually a pretty hostile place. We're reminded of that whenever NASA alerts the world that an asteroid is making a close appearance, and a scientists with the Jet Propulsion Laboratory just took some time to break down the next five asteroid flybys that we should all keep our eyes on, including one that might be too close for comfort. The handful of asteroids, which are thought to be as small as 8 meters in diameter to as large as 90 meters, will all pass within five lunar distances. One lunar distance is the space between the Earth and our moon, or about 238,900 miles. That might seem like a pretty comfortable gap, but in terms of the vastness of space, a rock jetting past our planet at such a distance is a pretty close shave.