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X Logo used since 2023 [a] X homepage visited while logged out in August 2024 Formerly Twitter (2006–2023) Type of site Social networking service Available in Multilingual Founded March 21, 2006 ; 18 years ago (2006-03-21), in San Francisco, California, U.S. Area served Worldwide, except blocking countries Owner Odeo (March–October 2006) Obvious Corporation (2006–2007) Twitter, Inc ...
A list of the top 15 GDP-per-capita countries from 2016 to 2017, contains most of the major global tax havens (see GDP-per-capita tax haven proxy for more detail): International Monetary Fund (2017) World Bank (2016) [ 21 ] [ 22 ]
The planet has 6.9 Earth masses and 1.8–2.4 Earth radii, and with its close orbit receives 40 percent more stellar radiation than Earth, leading to surface temperatures of about 60° C. [ 144 ] [ 145 ] [ 146 ] HD 40307 g , a candidate planet tentatively discovered in November 2012, is in the circumstellar habitable zone of HD 40307 . [ 147 ]
The average of the true solar day during the course of an entire year is the mean solar day, which contains 86,400 mean solar seconds. Currently, each of these seconds is slightly longer than an SI second because Earth's mean solar day is now slightly longer than it was during the 19th century due to tidal friction. The average length of the ...
Another likely candidate is Alpha Centauri, Earth's nearest Sun-like star system 4.37 light-years away. Estimates place the probability of finding a habitable planet around Alpha Centauri A or B at roughly 75%. [ 11] Alpha Centauri is the target of several exoplanet-finding missions, including Breakthrough Starshot and Mission Centaur, the ...
Solar irradiance is the power per unit area ( surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre (W/m 2) in SI units .