The age of the Universe

@article{Sneden2001TheAO,  title={The age of the Universe},  author={Christopher Sneden},  journal={Nature},  year={2001},  volume={409},  pages={673-675},  url={https://api.semanticscholar.org/CorpusID:4316598}}
Astronomers now have a better clock, based on radioactive uranium, that puts the age of the Universe at around 12.5 billion years, higher than previously thought.
6 Citations

6 Citations

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7 References

Thorium in G-dwarf stars as a chronometer for the Galaxy

Observation of the radioactive nuclide 232Th (half life 14 Gyr) in stars of various ages offers the possibility of directly relating the timescale for nucleosynthesis to that for stellar and galactic…

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Uncertainties in the Th cosmochronometry

Recent observations of r-nuclei, and in particular of Th, in ultra-metal poor stars revived the old idea that the Th cosmochronometry could provide an age estimate of the oldest stars in the Galaxy,…

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A Search for Stars of Very Low Metal Abundance. III. UBV Photometry of Metal-weak Candidates

We present photoelectric UBV photometry for some 2600 metal-poor dwarf and giant candidates selected from the HK objective-prism/interference-filter survey of Beers and colleagues. These data provide…

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