Skip to main content

Thank you for visiting You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript.


A hint of normality at last?


The chemical diversity of the oldest stars is greater than we thought. The discovery of an extremely iron-poor star with a 'normal' ratio of carbon to iron challenges our perception of early chemical enrichment. See Letter p.67

This is a preview of subscription content, access via your institution

Access options

Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. Caffau, E. et al. Nature 477, 67–69 (2011).

    Article  ADS  CAS  Google Scholar 

  2. Spergel, D. N. et al. Astrophys. J. Suppl. 170, 377–408 (2007).

    Article  ADS  Google Scholar 

  3. Cyburt, R. H., Fields, B. D. & Olive, K. A. J. Cosmol. Astro-Part. Phys. 11, 012 (2008).

    Article  ADS  Google Scholar 

  4. Sbordone, L. et al. Astron. Astrophys. 522, A26 (2010).

    Article  Google Scholar 

  5. Frebel, A., Johnson, J. L. & Bromm, V. Mon. Not. R. Astron. Soc. 380, L40–L44 (2007).

    Article  ADS  Google Scholar 

  6. Umeda, H. & Nomoto, K. Nature 422, 871–873 (2003).

    Article  ADS  CAS  Google Scholar 

  7. Frebel, A., Collet, R., Eriksson, K., Christlieb, N. & Aoki, W. Astrophys. J. 684, 588–602 (2008).

    Article  ADS  CAS  Google Scholar 

  8. Ryan, S. G., Gregory, S. G., Kolb, U., Beers, T. C. & Kajino, T. Astrophys. J. 571, 501–511 (2002).

    Article  ADS  Google Scholar 

Download references

Author information

Authors and Affiliations


Corresponding author

Correspondence to John E. Norris.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Norris, J. A hint of normality at last?. Nature 477, 37–39 (2011).

Download citation

  • Published:

  • Issue Date:

  • DOI:

This article is cited by


Quick links

Nature Briefing

Sign up for the Nature Briefing newsletter — what matters in science, free to your inbox daily.

Get the most important science stories of the day, free in your inbox. Sign up for Nature Briefing