In the past, the study of (1)…..was mainly carried out by astronomers using telescopes. However, (2)… .sometimes had it wrong. Meanwhile, apart from the desire to conquer the world around, humans also want more space to accomodate the world’s increasing(3)….
Owing to the developments in space technology, humans have made spectacular explorations and discoveries of the space. The (4)… .can be conducted either by unmanned robotic probes or by human spaceflights.
Undeniably, those achievements have been made quickly as a (5)……of the “space race” by the Soviet Union and the United States. Within more than two(6)……, from the beginning of 1950s to 1970s, the two nations launched many of the milestones, from launching living beings into space to launching flybies to observe (7)…….
However, the biggest achievement of the 21st century has been the cooperation in launching the International Space Station, (8)….. serves as space environment research laboratory for experiments in many fields. It is also suited for the testing of spacecraft (9)….. and equipment required for missions to the Moon and Mars. Hopefully, in the near future, space technological advancements will soon allow us to (10)…… habitable space environment.
