Mysterious characters

12345678910
Across
  1. 4. American alternative rock band with their popular hit "Smells Like Teen Spirit"
  2. 8. astronaut who participated in the Apollo 11 mission
  3. 9. German composer known for his famous symphonies
  4. 10. super hero bat
Down
  1. 1. black president of the united states
  2. 2. creator of a tower in Paris
  3. 3. designer behind street art in south africa
  4. 5. E=mc2
  5. 6. creator of a French luxury brand
  6. 7. fictional character playing the role of the dark lord of the sith in a mythical saga