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SDSS J102915 172927
SDSS J102915+172927 or Caffau's Star is a population II star in the galactic halo, seen in the constellation Leo. It is about 13 billion years old, making it one of the oldest stars in the Galaxy. At the time of its discovery, it had the lowest metallicity of any known star. It is small (less than 0.8 solar masses), deficient in carbon, nitrogen, oxygen, and completely devoid of lithium. Because carbon and oxygen provide a fine structure cooling mechanism that is critical in the formation of low-mass stars, the origins of Caffau's Star are somewhat mysterious. It has been suggested, both for theoretical and observational reasons, that the formation of low-mass stars in the interstellar medium requires a critical metallicity somewhere between 1.5×10−8 and 1.5×10−6. The metallicity of Caffau's Star is less than 6.9×10−7. According to Schneider et al., cooling by dust rather than the fine structure lines of CII and OI may have enabled the creation of such low-mass, m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sloan Digital Sky Survey
The Sloan Digital Sky Survey or SDSS is a major multi-spectral imaging and spectroscopic redshift survey using a dedicated 2.5-m wide-angle optical telescope at Apache Point Observatory in New Mexico, United States. The project began in 2000 and was named after the Alfred P. Sloan Foundation, which contributed significant funding. A consortium of the University of Washington and Princeton University was established to conduct a redshift survey. The Astrophysical Research Consortium (ARC) was established in 1984 with the additional participation of New Mexico State University and Washington State University to manage activities at Apache Point. In 1991 the Sloan Foundation granted the ARC funding for survey efforts and the construction of equipment to carry out the work.. Background At the time of its design, the SDSS was a pioneering combination of novel instrumentation as well as data reduction and storage techniques that drove major advances in astronomical observations, di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Social Democratic Party Of Slovakia
The Social Democratic Party of Slovakia ( sk, Sociálnodemokratická strana Slovenska, SDSS) was a centre-left political party in Slovakia. Its last chairman, since 1993, was , and its chairman in 1992 was Alexander Dubček. Czechoslovakia (until 1992) The party arose after the Velvet Revolution, in January 1990, and declared that it will attempt to continue the work of the "Slovak Social Democratic Party of (the Kingdom of) Hungary" (1905–1918) and of other social democratic parties forbidden in 1948 by the Communists. Most of the time it failed to win seats in elections. In 1992 the party gained five seats (6.1% of the votes in Slovakia) in the "House of Nations" (Sněmovna národů) of the federal parliament of Czechoslovakia, which however was only because the party chairman was briefly Alexander Dubček, the ex-Czechoslovak leader, in 1992. Prior to his early death in November 1992, he was one of their MPs in the federal parliament. Independent Slovakia (from 1993) From 1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Independent Democratic Serb Party
The Independent Democratic Serb Party ( sh-Cyrl-Latn, Самостална демократска српска странка, Samostalna demokratska srpska stranka, SDSS) is a social-democratic political party in Croatia representing the interests of the Croatian Serbs. It holds, progressive, pro-European stances and is generally considered a centre-left party. History It was formed in 1997 and led by Vojislav Stanimirović. In the 2003 Croatian parliamentary election, it beat its main rival, the Serb People's Party (SNS), taking all three seats reserved for Serb representatives in the Croatian parliament. After the elections, the Independent Democratic Serb Party made an agreement with the winning Croatian Democratic Union led by Ivo Sanader in which they agreed on fulfilling several Independent Democratic Serb Party demands such as refugee return, strengthening of national equality, judicial reform and cooperation with neighbouring countries. In the 2007 Croatian parlia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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