Sun

The Sun (in Greek: Helios, in Latin: Sol) is the star at the center of the Solar System and is by far the most important source of energy for life on Earth. It is a nearly perfect spherical ball of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. Its diameter is about 109 times that of Earth, and it has a mass about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System.About three quarters of the Sun's mass consists of hydrogen; the rest is mostly helium, with much smaller quantities of heavier elements, including oxygen, carbon, neon and iron.

The Sun is a G-type main-sequence star (G2V) based on spectral class and it is informally referred to as a yellow dwarf. It formed approximately 4.567 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became increasingly hot and dense, eventually initiating nuclear fusion in its core. It is thought that almost all stars form by this process.

Sun (disambiguation)

The Sun is the star at the center of the Solar System.

Sun or the Sun may also refer to:

Other common meanings

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The Sun (Sydney)

The Sun was an afternoon tabloid newspaper, first published under this name in 1910. It was acquired from Associated Newspapers by Fairfax Holdings in Sydney, Australia in 1953, as the afternoon companion to The Sydney Morning Herald. The former Sunday edition, the Sunday Sun was discontinued and merged with the Sunday Herald into the tabloid Sun-Herald at the same time.

Publication of The Sun ceased on 14 March 1988. Some of its content, and sponsorship of the Sydney City to Surf footrace, was continued in The Sun-Herald.

References

Stargate SG-1

Stargate SG-1 (often abbreviated as SG-1) is an adventure and military science fiction television series and part of Metro-Goldwyn-Mayer's Stargate franchise. The show, created by Brad Wright and Jonathan Glassner, is based on the 1994 science fiction film Stargate by Dean Devlin and Roland Emmerich. The television series was filmed in and around the city of Vancouver, British Columbia, Canada. The series premiered on Showtime on July 27, 1997; the final episode first aired on Sky1 on March 13, 2007. With 214 episodes over 10 seasons, Stargate SG-1 had surpassed The X-Files as the longest-running North American science fiction television series, a record it holds to this day, regarding the time span it was running. However, regarding the number of episodes, it has since been surpassed by the series Smallville with 218 episodes, and Supernatural with 228.

The story of Stargate SG-1 begins about a year after the events of the feature film, when the United States government learns that an ancient alien device called the Stargate can access a network of such devices on a multitude of planets. SG-1 is an elite United States Air Force special operations team, one of about 20 teams from Earth who explore the galaxy and defend against alien threats such as the Goa'uld, the Replicators, and the Ori. The series draws primarily upon Egyptian mythology, Greek mythology, Norse mythology, and Arthurian legend.

Schlachtgeschwader 1

Schlachtgeschwader 1 (SchlG 1, since 1943 rather SG 1) was a German ground-attack wing during World War II. The first formation was on 13 January 1942, from the II.(Schl)/Lehrgeschwader 2, initially with two Gruppen each made of four Staffeln. The second formation was on 18 October 1943, by renaming the existing Sturzkampfgeschwader 1 (StG 1). The new unit's name became abbreviated simply SG 1.

The first formation

Schlachtgeschwader 1 of the Luftwaffe was formed on 13 January 1942 at Werl. I/SchlG 1 was outfitted with Messerschmitt Bf 109E-7s. As of II/SchlG 1, the 5th and 6th Staffeln were equipped with Henschel Hs 129B-1s, and the 7th Staffel with Henschel Hs 123As. The 7th Staffel took over the aircraft of the 8th Staffel in April 1942. In the same month, the training was completed, and the wing was ordered to the Crimea for duty with IV Fliegerkorps, Luftflotte 4.

The 4th Staffel and the 8th Staffel, while formally part of SchlG 1, operated independently.

Crimea 1942-3