難関大向け｜英語長文問題120（宇宙）783語＋和訳・解答解説

For much of modern history, space exploration has been justified by a familiar promise: by going farther from Earth, humanity will gain knowledge, develop new technologies, and perhaps secure its future. This argument is powerful partly because it combines curiosity with practicality. A telescope placed beyond the atmosphere can reveal objects that are difficult to observe from the ground, while technologies designed for harsh conditions in space may later prove useful on Earth. Yet the significance of space exploration becomes less obvious when these benefits are treated as automatic. If exploration is to be more than an expensive symbol of ambition, we must ask not simply what discoveries it produces, but what kinds of questions it teaches us to ask about risk, value, and responsibility.

One reason this question matters is that the practical results of exploration are often unpredictable. A mission may be planned to study a distant planet, while the techniques developed for navigation, communication, or materials testing later become useful in different fields. This uncertainty is sometimes presented as a weakness: why invest heavily in projects whose returns cannot be guaranteed? But it can also be part of the value. Research at the edge of present knowledge forces engineers and scientists to solve problems for which no standard method exists. Exploration thus creates a network of skills, tools, and ways of thinking that may become important only when new problems arise. Its contribution may lie less in immediate products than in increasing society’s capacity to respond to the unexpected.

However, this argument has limits. The fact that uncertain research can produce valuable results does not mean that every space project deserves support. Resources are finite, and money spent on one goal cannot be spent on another. It is therefore reasonable to ask whether funds used for a technically impressive mission might achieve more if directed toward problems on Earth. Yet this comparison can be too simple. Large scientific projects can support education, cooperation, and industries that would not otherwise develop in the same way. At the same time, supporters of exploration should not use such indirect benefits to avoid criticism. A mission that lacks a clear scientific purpose, repeats work with little additional value, or is designed mainly to display prestige should not be protected merely by the romance of space.

The deeper issue appears when we consider what exploration does to our sense of scale. Images of Earth from space are often said to make national borders seem small and environmental problems more urgent. Such claims can sound sentimental, but they point to a genuine change in perspective. Space science repeatedly places human life within systems far larger than ordinary experience: planetary climates, long geological histories, and physical processes operating over immense distances. This does not automatically make people wiser or more cooperative. Information alone rarely changes behavior. Still, it can challenge assumptions that seem natural only because we encounter them every day. A society that studies other planets may, for example, become better able to recognize that Earth’s atmosphere is not an unlimited background but a delicate system with particular conditions. The value lies not in learning that Earth is “special,” but in understanding more precisely what makes a habitable environment possible.

There is also a danger in allowing space to become an escape from difficult choices on Earth. The possibility of settling other worlds is sometimes described as insurance for humanity. In the very long term, spreading human communities beyond one planet may reduce certain risks. But this idea can be misleading if it encourages the belief that damaged environments, unequal access to resources, or social conflicts can simply be left behind. Any community established far from Earth would depend on complex technology, careful resource management, and cooperation under severe constraints. Space settlement would not free humans from the need to manage shared systems responsibly; it would make that need even more obvious. The skills required to live elsewhere may therefore resemble, rather than replace, the skills required to live sustainably here.

The strongest case for space exploration, then, is neither that it will certainly solve earthly problems nor that human curiosity alone justifies any cost. Its significance depends on how exploration is designed and how its results are understood. Projects are most valuable when they pursue important questions, create knowledge and capabilities that can be shared, and remain open to public evaluation of their costs and purposes. Under those conditions, space exploration can do something unusual: it can extend human activity beyond familiar boundaries while also forcing us to examine the limits within which we already live. The paradox is that looking outward may matter most when it changes how carefully we look back at Earth.

Q1. Which view best reflects the author’s argument about exploration?

1. Exploration gains significance when its broader intellectual effects are considered.
2. Exploration deserves support whenever technological benefits eventually reach everyday life.
3. Exploration should be valued partly for reshaping judgments about responsibility.
4. Exploration becomes worthwhile only when discoveries justify its financial cost.

Q2. Which principle would the author most likely apply to space projects?

1. Scientific projects should be judged by more than possible indirect benefits.
2. Scientific projects become defensible when they stimulate education and industry.
3. Scientific projects deserve priority when their technical achievements are impressive.
4. Scientific projects should avoid criticism if their broader effects are beneficial.

Q3. Which statement is NOT supported by the passage?

1. Living beyond Earth would intensify demands for responsible resource management.
2. Human settlement elsewhere would reduce dependence on careful shared-system management.
3. Uncertain research can prepare societies for challenges not yet anticipated.
4. Indirect benefits cannot by themselves shield weak missions from criticism.