Small Celestial Objects

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Across
  1. 2. Vast collection of stars, gas, and dust (6 letters).
  2. 4. Everything in space, time, and matter (8 letters).
  3. 7. Small space particle, often smaller than an asteroid (9 letters).
  4. 8. Icy object with a glowing tail (5 letters).
  5. 9. Rocky space rock found in the asteroid belt (9 letters).
Down
  1. 1. Celestial object orbiting a star (6 letters).
  2. 3. Surviving space rock that lands on Earth (9 letters).
  3. 5. Bright streak when it burns up in Earth's atmosphere (6 letters).
  4. 6. Includes the Sun, planets, and more (11 letters).