Cygnus (constellation)

Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.

Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.

Swan

Swans are birds of the family Anatidae within the genus Cygnus. The swans' close relatives include the geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini. Sometimes, they are considered a distinct subfamily, Cygninae. There are six or seven species of swan in the genus Cygnus; in addition there is another species known as the coscoroba swan, although this species is no longer considered one of the true swans. Swans usually mate for life, though "divorce" does sometimes occur, particularly following nesting failure, and if a mate dies, the remaining swan will take up with another. The number of eggs in each clutch ranges from three to eight.

Etymology and terminology

The English word 'swan', akin to the German Schwan, Dutch zwaan and Swedish svan, is derived from Indo-European root *swen (to sound, to sing). Young swans are known as swanlings or as cygnets, from Greek κύκνος, kýknos and from the Latin word cygnus ("swan") and the Old French suffix -et ("little"). An adult male is a cob, from Middle English cobbe (leader of a group); an adult female is a pen.

Cygnus (Chinese astronomy)

According to traditional Chinese uranography, the modern constellation Cygnus is located within the northern quadrant of the sky, which is symbolized as the The Black Tortoise of the North (北方玄武, Běi Fāng Xuán Wǔ).

The name of the western constellation in modern Chinese is 天鵝座 (tiān é zuò), meaning "the swan constellation".

Stars

The map of Chinese constellation in constellation Cygnus area consists of :

See also

References

External links

Adventure (disambiguation)

An adventure is an undertaking into the unknown, often having a connotation of danger and excitement.

Adventure or The Adventure may also refer to:

Arts and entertainment

Titled works

Games

Music

Adventure (1925 film)

Adventure is a lost 1925 film produced by Famous Players-Lasky, distributed by Paramount Pictures and directed by Victor Fleming. It is based on Jack London's 1911 novel Adventure.

Plot

A Solomon Islands plantation owner, David Sheldon (Tom Moore) becomes ill from blackwater fever following the death of many of his fieldhands from the disease. Joan Lackland (Pauline Starke), a female soldier of fortune, arrives by schooner in the islands. Enlisting the aid of her Kanaka crew, she defends Sheldon from an attack by the natives, led by Googomy (Noble Johnson). Joan becomes David's business partner after nursing him back to health and helps protect his mortgaged property from two greedy moneylenders. In attempting to gain revenge, the moneylenders incite the natives to revolt.

Cast

Dual-sport motorcycle

A dual-sport motorcycle is a type of street-legal motorcycle that is designed for both on and off-road use. The terms all-road and dual-purpose are also used for this class of motorcycles. Dual-sports are equipped with street-legal equipment such as lights, speedometer, mirrors, horn, license plate mounting, and muffler and can, therefore, be registered and licensed.

Evolution of dual-sports

The concept of a versatile motorcycle equally at home on dirt and pavement is as old as motorcycling itself. Most roads were still unpaved when motorized bicycles first appeared around 1900. In a sense, all motorcycles at that time were dual-sports, intended to be used on dirt as well as pavement. Advertisements well into the 1920s depict motorcycles on dirt roads, raising clouds of dust. By 1940, most roads in developed countries were paved and motorcycles had become heavier and more oriented to the street. In the 1950s and 1960s British manufacturers such as Triumph and BSA offered versions of their relatively light street motorcycles with high exhaust pipes, and called them scramblers.