Coba jelasin Lihat pula dari Hukum Hubble dong

Geometri Hiperbolik (ruang membentuk kurva karena pengembangan)

Geometri Eliptik (ruang membentuk kurva karena gravitasi)

Freedman et. al.: Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant. The Astrophysical Journal, Volume 553, Issue 1, pp. 47–72. Online at http://adsabs.harvard.edu/cgi-bin/nph-bib_query?2001ApJ...553...47F