universe

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Across
  1. 4. A natural satellite that orbits the Earth and affects tides.
  2. 5. The force that pulls objects toward each other — it keeps the planets in orbit around the sun.
  3. 6. A spacecraft that travels beyond Earth to explore space.
  4. 8. The red planet — known as the fourth planet from the sun.
Down
  1. 1. The star at the center of our solar system that gives us light and heat.
  2. 2. The planet we live on — it’s the third planet from the sun.
  3. 3. A huge ball of gas that shines in the night sky and may have planets orbiting it.
  4. 4. A bright flash seen in the sky when a meteoroid burns in the atmosphere.
  5. 5. A collection of billions of stars, gas, and dust held together by gravity — the Milky Way is one.
  6. 7. A frozen ball of ice and dust that orbits the sun and sometimes has a glowing tail.