Maths and Space

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Across
  1. 2. Numeric system which does not have a symbol for zero.
  2. 5. What is OneRepublic counting?
  3. 7. model for the birth of the universe.
  4. 10. Which numerals do we use today?
  5. 13. Biggest planet in Solar System.
  6. 16. Who sings 'I believe in a think called love'?
  7. 17. Oasis have a song entitled 'Champagne __________'.
  8. 19. Name of the first artificial Earth satellite.
  9. 21. 'Space Bound' is a song by which artist?
Down
  1. 1. What substance does Earth contain that is found on no other planet in the Solar System in liquid form?
  2. 3. First animal to orbit the Earth.
  3. 4. Taylor Swift has a 'blank ______, baby'
  4. 6. Which technological advancement is meant to fly according to Nicki Minaj?
  5. 8. Hugely influential Italian astronomer and physicist. (Hint: Bohemian Rhapsody)
  6. 9. Only number in the English language with the same number of letters as the number itself.
  7. 11. 3.14159 are the first 6 digits of which irrational number?
  8. 12. Which artist makes the profound claim that 'The square root of 69 is 8 somethin'?
  9. 14. Surname of the first human to journey into outer space.
  10. 15. This band has a song entitled '2+2=5'
  11. 18. Study of space is called...
  12. 20. Where is Pythagoras from?