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| | Timeline of solar system exploration Summary |
 | | Sources of revenue include planetary science data, returned samples, delivery of science instruments to planetary destinations, use of the abundant natural resources in space, delivery of television and Internet content in the form of photos and videos, manufacture of materials in space, and space tourism. |
 | | The exploration of a planet by spacecraft can be characterized in terms of several stages or levels of completeness: reconnaissance, orbital survey, surface investigation, sample return, and human exploration. |
 | | Depending on the sensors aboard the spacecraft, data may be collected on planetary surface composition; atmospheric composition, structure, and dynamics; the nature of the gravity field, which can yield information about the internal structure of the planet; and the nature of the magnetic field. |
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