Pointlessly difficult scientific books crossword

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Across
  1. 2. _______ of the world, work by Kepler that outlined the third law of planetary motion, and asserts his belief that he had discovered part of God's plan for the universe.
  2. 3. In Latin, 'Astronomia Nova' - work by Kepler that outlined his first two laws of planetary motion. (Two words)
  3. 5. _______________ Concerning the Two Chief World Systems, Galileo's work of 1632 defending the heliocentric view of the universe, for which he was arrested by the Catholic Church.
  4. 6. ____________ Messenger, Galileo's work of 1610 discussing his discoveries of the moons of Jupiter and surface of the moon.
Down
  1. 1. ________ Mathematica - Newton's seminal work.
  2. 2. On the Revolutions of the __________ spheres - Copernicus' work that establishes the heliocentric system.
  3. 4. Book by Descartes that may have influenced Newton - defending the heliocentric theory. (Two words)