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外层空间(outer space) 地球大气层以外广袤的宇宙空间。又称太空或空间。外层空间的下界迄今尚无定论,一般认为距地面约100千米。按照有关国际组织的定义,把地球静止轨道(高度约35800千米)以下的空间称为近地空间,距地面80000千米至768000千米(后一数字等于地球到月球距离的2倍)的外层空间称为深空。迄今人类发射的航天器,包括各种卫星、飞船、空间站、航天飞机等,绝大多数运行在近地空间。航天器要不因为大气阻力而过早陨落,其轨道高度一般须超过180千米。
Outer space A vast space outside the Earth’s atmosphere. Also known as space or space. The lower bound of outer space has so far been inconclusive, and it is generally believed that it is about 100 kilometers away from the ground. According to the definitions of the relevant international organizations, the space below the geostationary orbit (about 35800 km in height) is called near-Earth space, and the distance from the earth’s surface is 80000 km to 768000 km (the latter figure is equal to twice the distance between the Earth and the Moon) Outer space is called deep space. To date, the spacecraft launched by mankind, including various kinds of satellites, spacecraft, space stations, space shuttles and the like, are mostly operated in near-Earth space. Spacecraft or because of atmospheric resistance and premature fall, the orbital height should generally be more than 180 km.