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The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
This is a timeline of Solar System exploration ordering events in the exploration of the Solar System by date of spacecraft launch. It includes: It includes: All spacecraft that have left Earth orbit for the purposes of Solar System exploration (or were launched with that intention but failed), including lunar probes .
Timeline of Solar System exploration; Timeline of first images of Earth from space; List of former planets; List of hypothetical Solar System objects in astronomy; Historical models of the Solar System; History of astronomy; Timeline of cosmological theories; The number of currently known, or observed, objects of the Solar System are in the ...
First spacecraft to impact another planet (Mars). USSR Mars 2: 2 December 1971: First soft landing on Mars. First signals from Martian surface. First photograph from Martian surface. USSR Mars 3: 3 March 1972: First spacecraft on a trajectory out of the solar system. First spacecraft to use all-nuclear electrical power (SNAP-19 RTGs). USA (NASA ...
The term "Solar System" entered the English language by 1704, when John Locke used it to refer to the Sun, planets, and comets as a whole. [40] By then it had been stablished beyond doubt that planets are other worlds, then the stars would be other distant suns, so the whole Solar System is actually only a small part of an immensely large ...
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The following is a list of Solar System objects by orbit, ordered by increasing distance from the Sun. Most named objects in this list have a diameter of 500 km or more. The Sun, a spectral class G2V main-sequence star; The inner Solar System and the terrestrial planets. 2021 PH27; Mercury. Mercury-crossing minor planets; Venus. Venus-crossing ...