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The Sun is the star at the center of the Solar System. It is a massive, ... The English weekday name Sunday stems from Old English Sunnandæg "sun's day", ...
720,000 km/h (450,000 mi/h) [10] Orbital period. ~230 million years [10] The Solar System [d] is the gravitationally bound system of the Sun and the objects that orbit it. [11] It was formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.
Astronomical naming conventions. In ancient times, only the Sun and Moon, a few stars, and the most easily visible planets had names. Over the last few hundred years, the number of identified astronomical objects has risen from hundreds to over a billion, and more are discovered every year. Astronomers need to be able to assign systematic ...
The name is originally from Arabic: المئزر al-miʾzar ('apron, waistband, girdle'). Also called 禄 Lù ('Status'), one of the "Three Stars" in Chinese mythology. The Lù star is believed to be Zhang Xian, who lived during the Later Shu dynasty. The word lù specifically refers to the salary of a government official. As such, the Lù star ...
Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.
Proper names of planetary systems often follow common themes – for example, the planets of the star Copernicus are named after European astronomers. Proper names for planets outside of the Solar System – known as exoplanets – are chosen by the International Astronomical Union (IAU) through public naming contests known as NameExoWorlds.
The word Japan is an exonym, and is used (in one form or another) by many languages. The Japanese names for Japan are Nihon ( にほん ⓘ) and Nippon ( にっぽん ⓘ ). They are both written in Japanese using the kanji 日本 . During the third-century CE Three Kingdoms period, Japan was inhabited by the Yayoi people who lived in Kyushu up ...
In SI base units. 1.9884 × 1030 kg [1] The solar mass ( M☉) is a standard unit of mass in astronomy, equal to approximately 2 × 1030 kg. It is approximately equal to the mass of the Sun. It is often used to indicate the masses of other stars, as well as stellar clusters, nebulae, galaxies and black holes. More precisely, the mass of the sun is.