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2. Zeldovitsh;, J. Minu Universum. Valgus, Tallinn, 1990.

3. Roos, M. Introduction to Cosmology. Wiley, New York, 1997.

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10. NASA - Home

11. W.M. Keck Observatory

12. Kosmoloogia - Astronoomiline tehnika: Illustratsioonid.

13. Owens Valley Radio Observatory

14. Chandra:: Photo Album

15. Illusterad Vetenskap

16. The Hubble Space Telescope