known universe

例句：

1. 1. The study of the known universe has led to many new discoveries.
   对已知宇宙的研究已经导致了许多新的发现。
2. 2.The discovery of a new planet in the known universe is exciting news.
   在已知宇宙中发现一个新行星是令人兴奋的新闻。
3. 3.The known universe is vast and full of wonders that we still cannot fully comprehend.
   已知宇宙广阔而充满奇迹，我们仍然不能完全理解。