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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 .
It is approximately 24 hours, 39 minutes, 35 seconds long. A Martian year is approximately 668.6 sols, equivalent to approximately 687 Earth days [ 1 ] or 1.88 Earth years. The sol was adopted in 1976 during the Viking Lander missions and is a measure of time mainly used by NASA when, for example, scheduling the use of a Mars rover .
A series of cleaning events beginning on Sol 1149 (April 20, 2007) allowed Opportunity ' s solar energy production to rise to above 800 watt-hours per Sol. By Sol 1163 (May 4, 2007) the solar array current was peaking above 4.0 amperes, values not seen since Sol 16 (February 10, 2004). [33]
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 led to an increase in energy output to 240 watt-hours (860 kJ) per day. NASA officials stated that this increase in energy was to be used predominantly for driving. [35] On April 18, 2009 (sol 1879) and April 28, 2009 (sol 1889) energy output of the solar arrays were increased by cleaning events.
Its successor, the International Space Station, has maintained a continuous human presence in space since 2001. In 2004, U.S. President George W. Bush announced the Vision for Space Exploration , which called for a replacement for the aging Shuttle, a return to the Moon and, ultimately, a crewed mission to Mars.
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The principal change was to space leap years differently so as to make the average calendar year 365.2425 days long, more closely approximating the 365.2422-day 'tropical' or 'solar' year that is determined by the Earth's revolution around the Sun. The reform advanced the date by 10 days: Thursday 4 October 1582 was followed by Friday 15 ...