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  1. Avaruuslennot

  2. parallax method

  3. Projekt Sonnenaktivitätszyklen

  4. Слънчеви цикли

  5. Onko kosminen säteily vaarallista?

  6. Variable Stars- Why we know how far they are

  7. Saros 136- the eclipse of the century

  8. TheTwoSystems

  9. auringon syklit

  10. Ursa Major eri suunnista

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