释义 |
space environment
space environmentThe region beginning at the lower boundary of the Earth's ionosphere (approximately 50 km) and extending outward that contains solid particles (asteroids and meteoroids), energetic charged particles (ions, protons, electrons, etc.), and electromagnetic and ionizing radiation (x-rays, extreme ultraviolet, gamma rays, etc.). See also ionosphere.space environment
space environment[′spās in‚vi·ərn·mənt] (astronomy) The environment encountered by vehicles and living creatures in space, characterized by absence of atmosphere. |