Portsmouth vs Vega

Informations

Portsmouth ( (listen)) is a port city primarily built on Portsea Island in the county of Hampshire, South East England. It is also known colloquially as Pompey, a nickname shared with HMNB Portsmouth and the Portsmouth Football Club. It is the United Kingdom's only island city. Portsmouth is situated 70 miles (110 km) south-west of London and 19 miles (31 km) south-east of Southampton. Portsmouth's population was recorded as 205,100 in the 2011 UK Census. The city forms part of the South Hampshire conurbation. Portsmouth's history can be traced back to Roman Britain. A significant naval port for centuries, it has the world's oldest dry dock. Portsmouth was England's first line of defence during the 1545 French invasion. By the early nineteenth century, the world's first mass-production line was set up in Portsmouth Dockyard's Block Mills; this made it the world's most industrialised site, and the birthplace of the Industrial Revolution. Portsmouth was the most heavily-fortified town in the world and was considered "the world's greatest naval port" at the height of the British Empire, during the Pax Britannica. The Palmerston Forts were built around Portsmouth in 1859 in anticipation of another invasion from continental Europe. King Richard I first granted Portsmouth market town status on 2 May 1194 with a royal charter and a coat of arms, "a crescent of gold on a shade of azure, with a blazing star of eight points". On 21 April 1926, Portsmouth was elevated from town to city status. Its motto, "Heaven's Light Our Guide" (referring to the city's eight-pointed star and crescent-moon emblem), was registered in 1929. The 800th anniversary of the royal charter was celebrated on 2 May 1994. Portsmouth became a unitary authority on 1 April 1997, with its city council gaining the powers of a non-metropolitan county and district council previously held by Hampshire County Council.

The city was extensively bombed in World War II's Portsmouth Blitz (which resulted in the deaths of 930 people), and was the pivotal embarkation point for the 6 June 1944 D-Day landings. In 1982, a large proportion of the task force dispatched to liberate the Falkland Islands deployed from the city's naval base. Her Majesty's Yacht Britannia left the city to oversee the 1997 transfer of Hong Kong which, for many, marked the end of the British Empire. HMNB Portsmouth, considered the home of the Royal Navy, is the base for two-thirds of the UK's surface fleet. The city has a number of famous ships, including HMS Warrior; the Tudor carrack Mary Rose, and Horatio Nelson's flagship HMS Victory (the world's oldest naval ship still in commission). The former HMS Vernon naval-shore establishment has been redeveloped as the Gunwharf Quays retail park. Portsmouth is among the few British cities with two cathedrals: the Anglican Cathedral of St Thomas and the Roman Catholic Cathedral of St John the Evangelist. The waterfront and Portsmouth Harbour are dominated by the Spinnaker Tower, one of the United Kingdom's tallest structures at 170 metres (560 ft). Southsea is a seaside resort with an amusement arcade on Clarence Pier. Portsmouth F.C., the city's professional football club, play their home games at Fratton Park in Milton. Portsmouth has good road and rail links to London and the south of England. Portsmouth International Port is a commercial cruise-ship and international ferry port. It is the UK's second-busiest port (after Dover), handling about three million passengers a year. The University of Portsmouth has a student population of 23,000. Portsmouth is the birthplace of author Charles Dickens, engineer Isambard Kingdom Brunel and former Prime Minister James Callaghan.

Source: Wikipedia

Informations

Vega is the brightest star in the northern constellation of Lyra. It has the Bayer designation α Lyrae, which is Latinised to Alpha Lyrae and abbreviated Alpha Lyr or α Lyr. This star is relatively close at only 25 light-years from the Sun, and, together with Arcturus and Sirius, one of the most luminous stars in the Sun's neighborhood. It is the fifth-brightest star in the night sky, and the second-brightest star in the northern celestial hemisphere, after Arcturus. Vega has been extensively studied by astronomers, leading it to be termed "arguably the next most important star in the sky after the Sun". Vega was the northern pole star around 12,000 BC and will be so again around the year 13,727, when its declination will be +86° 14′. Vega was the first star other than the Sun to be photographed and the first to have its spectrum recorded. It was one of the first stars whose distance was estimated through parallax measurements. Vega has functioned as the baseline for calibrating the photometric brightness scale and was one of the stars used to define the zero point for the UBV photometric system.

Vega is only about a tenth of the age of the Sun, but since it is 2.1 times as massive, its expected lifetime is also one tenth of that of the Sun; both stars are at present approaching the midpoint of their life expectancies. Vega has an unusually low abundance of the elements with a higher atomic number than that of helium. Vega is also a variable star that varies slightly in brightness. It is rotating rapidly with a velocity of 236 km/s at the equator. This causes the equator to bulge outward due to centrifugal effects, and, as a result, there is a variation of temperature across the star's photosphere that reaches a maximum at the poles. From Earth, Vega is observed from the direction of one of these poles.Based on an observed excess emission of infrared radiation, Vega appears to have a circumstellar disk of dust. This dust is likely to be the result of collisions between objects in an orbiting debris disk, which is analogous to the Kuiper belt in the Solar System. Stars that display an infrared excess due to dust emission are termed Vega-like stars.

Source: Wikipedia