Outer space topic

Outer space, often simply called space, comprises the relatively empty regions of the universe outside the atmospheres of celestial bodies. Outer space is used to distinguish it from airspace (and terrestrial locations). There is no sharp boundary between airspace and outer space. Definitions vary, but the most common is that space consists of everything beyond the Kármán line, which is 100 kilometers (62 mi) above the Earth's surface. At this height, there is still detectable atmosphere, but... full article at wikipedia