Comparing similar articles and categorisation with Wikipedia

For reference, the most similar Wikipedia articles to that Nature News story are these:

  1. Cosmic string
  2. Galaxy formation and evolution
  3. Structure formation
  4. Galaxy groups and clusters
  5. Observational cosmology
  6. Cosmic microwave background radiation
  7. Physical cosmology
  8. Spiral galaxy
  9. Atlas of Peculiar Galaxies
  10. Large-scale structure of the cosmos
and the 50 most similar articles have these categories:
  1. Physical cosmology [17]
  2. Large-scale structure of the cosmos [6]
  3. Spiral galaxies [5]
  4. Galaxy morphological types [4]
  5. Living people [3]
  6. Dark matter [3]
  7. Astrophysics [3]
  8. Cosmic inflation [3]
  9. UGC objects [3]
  10. PGC objects [3]
  11. NGC objects [3]
  12. Astronomy timelines [2]
  13. Astroparticle physics [2]
  14. Eschatology [2]
  15. Theoretical physics [2]
  16. Galaxies [2]
  17. Cosmic rays [2]
  18. Elliptical galaxies [2]
  19. Arp objects [2]
  20. Messier objects [2]
  21. Local Group [2]
  22. Stellar phenomena [2]
  23. Barred spiral galaxies [2]
  24. Interacting galaxies [2]