We found one dictionary that defines the word observationally flat universe:

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1. Observationally flat universe: Wikipedia, the Free Encyclopedia

▸ Words similar to observationally flat universe ▸ Usage examples for observationally flat universe ▸ Idioms related to observationally flat universe ▸ Wikipedia articles (New!) ▸ Words that often appear near observationally flat universe ▸ Rhymes of observationally flat universe ▸ Invented words related to observationally flat universe