Space Challenge

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Across
  1. 5. This planet is home to many people.
  2. 8. This famous constellation consists of seven bright stars.
  3. 9. The name of the Galaxy that contains the Solar System.
  4. 12. The first spaceflight to land humans on the moon.
  5. 13. A group of stars that form well known patterns in the sky.
  6. 14. This star accounts for 99.86% of the mass in the solar system.
  7. 15. This planet was discovered in 1781 by William Herschel.
  8. 16. A system of billions of stars, gas and dust, held together by gravitational attraction.
Down
  1. 1. A year on this planet lasts 165 Earth days.
  2. 2. This planet has the most craters in the Solar System
  3. 3. A day on this planet is about 40 minutes longer than a day on Earth.
  4. 4. The first person to set foot on the moon.
  5. 6. This is the Earth's only natural satellite.
  6. 7. This planet has 67 moons.
  7. 8. This is a spiral Galaxy that is 2.73 million light-years away from Earth.
  8. 10. This planet orbits the sun every 29.4 Earth years.
  9. 11. This planet is named after the Roman goddess of love and beauty.