On the whole, it appears that the telescope, the spectroscope, and radar cannot alone provide the answers to many questions raised here and in other chapters of this book. What then can be done to provide more information about Mars? The solution to the problem is to make use of spacecraft which can carry instruments to the vicinity of the planet and, in due course, drop them onto its surface. The kinds of measurements that can be made with such instruments are described in chapter 13.
Ultimately, men will travel to Mars and land there. In 1965, the Mariner IV space vehicle passed within 9846 kilometers (6118 miles) of the surface of the planet and transmitted information concerning the Martian atmosphere, its surface, and its magnetic field. This is only a beginning of what can be a new era in the study of the solar system and even of the origin of life itself.
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