What's up there?

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Across
  1. 2. it's like a magical vehicle that can fly in space and take astronauts on adventures
  2. 4. a brave person who travels to space in a spaceship to learn about the stars and planets
  3. 5. a bright icy object with a long tail that zooms through space like a shooting star
  4. 6. it's a special place with big telescopes to look at stars and planets in the sky
  5. 7. it's like a family of planets, including Earth, that go around the sun
Down
  1. 1. imagine a big group of stars and planets, like our Milky Way!
  2. 2. it's not a star at all! It's a bright light that quickly shoots across the sky
  3. 3. Earth is one of these! It's a big round world that goes around the sun