Star lore

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Across
  1. 2. the shining blue of oceans
  2. 3. our old home of iron
  3. 5. the shining mountains of the ancients
  4. 6. the messenger and defender of the canvas
  5. 7. the undying sibling
Down
  1. 1. the greatest blue of luminosities
  2. 2. our hive filled with electronics and living
  3. 3. our greatest former-iron
  4. 4. the well-preserved sibling
  5. 8. our greatest imperial era