可以从以下两个方面回答为什么要发展载人航天的问题。开发利用空间资源需要发展载人航天外层空间（又称天或太空）是人类扩大其活动范围的最新疆域，它广阔无垠，拥有丰富的空间资源。空间资源可分为两类：一类是天然资源，如高真空、太阳能、月球、微小行星等；另一类是因航 The answer to the question of why manned space flight should be developed can be answered from the following two aspects. Development and utilization of space resources The need to develop manned space outer space (also known as sky or space) is the latest territory for mankind to expand its range of activities. It is vast and vast with abundant space resources. Space resources can be divided into two categories: one is natural resources, such as high vacuum, solar energy, the moon, tiny planets, etc .; the other is due to air