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Vega vs. Doncaster - Comparison of sizes
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Vega
Doncaster

Vega vs Doncaster

Vega
Doncaster
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Vega

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Country

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Population 0

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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
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Doncaster

StateEngland

Country

United Kingdom
Capital
Population 67977

Informations

Doncaster (, ) is a large minster and market town in South Yorkshire, England. Together with its surrounding suburbs and settlements, the town forms part of the Metropolitan Borough of Doncaster, which had a mid-2019 est. population of 311,890. The town itself has a population of 109,805. The Doncaster Urban Area had a population of 158,141 in 2011 and includes Doncaster and neighbouring small villages. Part of the West Riding of Yorkshire until 1974, Doncaster is about 17 miles (30 km) north-east of Sheffield, with which it is served by an international airport, Doncaster Sheffield Airport in Finningley.



Under the Local Government Act 1972, Doncaster was incorporated into a newly created metropolitan borough in 1974, itself incorporated with other nearby boroughs in the 1974 creation of the metropolitan county of South Yorkshire.

Source: Wikipedia

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