参考サイト
- Lawrence Berkeley National Laboratory,
The University of California for the U.S. Department of Energy, U.S.A.,
http://www.lbl.gov/
- Wilkinson Microwave Anisotropy Probe, GSFC, NASA, U.S.A., http://map.gsfc.nasa.gov/index.html
- Office of Public Outreach Space Telescope Science Institute, U.S.A.,
http://hubblesite.org/gallery/.
- The Albert Einstein Archives, The Jewish National & University Library,
The Hebrew University of Jerusalem, Israel.
- 国立天文台岡山天体物理観測所, http://www.oao.nao.ac.jp/pub/
- 国立科学博物館, http://www.kahaku.go.jp/
- Wikipedia, the free encyclopedia, http://www.wikipedia.com/
- IPA「教育用画像素材集サイト」 http://www2.edu.ipa.go.jp/gz/
.