Black History Month crossword

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Across
  1. 3. NASA mathematician whose orbital mechanics calculations were vital for U.S. spaceflights
  2. 4. invented the first traffic light
  3. 6. first African American arrested for refusing to give her bus seat months before Rosa Parks
  4. 8. first African American to win an Oscar
  5. 9. first African American woman to travel to space
Down
  1. 1. first African American woman to earn a Ph.D. in chemistry
  2. 2. first African American supreme court justice
  3. 5. broke the MLB color barrier
  4. 7. the first African American student to graduate from Harvard university