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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 ...
2017: Gravitational wave signal GW170817 is observed by the LIGO/Virgo collaboration. This is the first instance of a gravitational wave event observed to have a simultaneous electromagnetic signal when space telescopes like Hubble observed lights coming from the event, thereby marking a significant breakthrough for multi-messenger astronomy.
The dates listed are launch dates, but the achievements noted may have occurred some time later—in some cases, a considerable time later (for example, Voyager 2, launched 20 August 1977, did not reach Neptune until 1989).
Discovery and exploration of the Solar System is observation, visitation, and increase in knowledge and understanding of Earth's "cosmic neighborhood". [1] This includes the Sun , Earth and the Moon , the major planets Mercury , Venus , Mars , Jupiter , Saturn , Uranus , and Neptune , their satellites , as well as smaller bodies including ...
2017: AOL officially shutters its Instant Messenger platform after a 20-year run. It also announces the inception of Oath, Verizon's new digital umbrella, bringing AOL, Yahoo, HuffPost, Engadget ...
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 ...
Subcategories named "Astronomical objects discovered in <year>" should be sorted by discovery year, month, and day. Please use the sortkey YYYYMMDD if all are known. Otherwise, use YYYYMM?? for unknown day, and ? for unknown month and day. Astronomical objects discovered by (before 1500) should be sorted similarly, but omitting the century.
In February 2014, NASA released a Discovery Program 'Draft Announcement of Opportunity' for launch readiness date of December 31, 2021. [168] The final AO was released on November 5, 2014, and on September 30, 2015, NASA selected five mission concepts as finalists, [ 169 ] [ 170 ] each received $3 million for one-year of further study and ...