Fun Friday

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Across
  1. 1. Angle, or angular momentum (4)
  2. 5. Cosmopolitan government accommodates Latin American art (5)
  3. 6. A bit of ice cream or news (5)
  4. 7. Festival of Oman, strangely (4)
Down
  1. 2. Game shirt? (4)
  2. 3. Journal of Newton, a true freak (6)
  3. 4. Lover of R? (5)
  4. 6. Sirius Black hole? (4)