Herschel and the stars 2

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Across
  1. 4. come together in a group
  2. 6. talk about something
  3. 8. large round thing in space that moves around the sun
  4. 10. find or learn something for the first time
  5. 11. in a way that deliberately avoids harm or errors
  6. 14. name of a French Astronomer
  7. 16. choose something after thinking
Down
  1. 1. very strong
  2. 2. a conversation or debate about a specific topic
  3. 3. piece of land that has fence around or hedge around it
  4. 5. showing curiosity or concern about something or someone
  5. 7. spend time learning about something
  6. 9. name of the planet
  7. 12. try to do something but not able to do it
  8. 13. discussion where 2 or more people speak in favour of or against a view
  9. 15. show that something is true