Oldest stars are older still
Article Abstract:
The Milky Way Galaxy's oldest stars may be located in the central nuclear bulge rather than in outlying star clusters. Furthermore, the Galaxy's oldest stars are between 14 and 18 billion years old, which is one to two billion years older than the star clusters were thought to be. Y.-W. Lee, who made the observations on which these conclusions are based, argues that the Galaxy's interior formed first. However, the chemical composition of the bulge stars makes estimating their age difficult.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
User Contributions:
Comment about this article or add new information about this topic:
Discovery of three lead-rich stars
Article Abstract:
It has been possible to identify large quantities of lead in three metal-poor stars: HD187861, HD196944 and HD224959. The discovery of low-metallicity s-rich Pb stars allows constraint of the r-process contribution, which controls forecasts of the production of the long-lived actinides.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
User Contributions:
Comment about this article or add new information about this topic:
Measurement of stellar age from uranium decay
Article Abstract:
Research is presented concerning the use of uranium decay as a measurement of stellar age. The use of radioactive dating has resulted in an age of about 12.5-billion years being calculated for the minimum age of the Universe.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2001
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Where things are hopping. Silence of the forests. Island of lost birds: New Zealand triumphs in the rescue of endangered species
- Abstracts: Complementary endeavours. Towards a resolution of the lek paradox. Distinct beta-catenins mediate adhesion and signalling functions in C. elegans
- Abstracts: Genetics, taxonomy and conservation of the threatened California Gnatcatcher. Dragonfly pond restoration promotes conservation awareness in Japan
- Abstracts: Heavy element synthesis in the oldest stars and the early Universe. The age of the Universe
- Abstracts: The nature of the solar wind. Rapid acceleration of the polar solar wind