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Avsnitt fem - hur hittar man en planet?
Hur hittar vi egentligen planeter? Vad \xe4r egentligen en planet? Du kan se Venus med egna \xf6gon, men hur vet du / vi att det faktiskt \xe4r en planet och inte bara en stj\xe4rna? F\xf6lj med och f\xe5 obeg\xe5vade svar!