Optix's Colossal Cosmohunt

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Across
  1. 2. a mathematical solution to Einstein's theory of General Relativity
  2. 5. location of largest meteorite (The Hoba Meteorite) with mass of over 60 tonnes
Down
  1. 1. a star that changes both diameter and temperature while pulsing radially
  2. 3. believed to have rings
  3. 4. this friendly alien has guided our journey of knowledge