Solar system crossword

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Across
  1. 3. Jupiter, Saturn, Uranus, and Neptune
  2. 6. is the distance from a celestial body within which a second celestial body
  3. 7. a mixture of graphite particles formed in carbon stars and of silicates in oxygen-rich giants
  4. 9. steep cliff
  5. 10. a planet whose orbit lies within the asteroid belt
  6. 11. when a large distribution of matter, such as a galaxy cluster, sits between Earth and a distant light source
  7. 15. a planet that orbits a star outside the solar system.
  8. 16. the velocity of a star or other body along the line of sight of an observer.
  9. 18. the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
  10. 19. A moon that orbits near the edge of a planetary ring
  11. 21. a region of the solar system beyond the orbit of Neptune,
  12. 23. a large planet of relatively low density consisting predominantly of hydrogen and helium,
  13. 24. the growth in mass of any celestial object due to its gravitational attraction
  14. 25. a body that could or did come together with many others under gravitation to form a planet.
Down
  1. 1. the region in space between the orbits of Mars and Jupiter
  2. 2. a giant planet composed mostly of elements heavier than hydrogen and helium
  3. 4. Mercury, Venus, Earth, and Mars
  4. 5. states that the Sun, when forming in the nebula, generated planets, asteroids, etc from spinning disk of matter called the accretion disk
  5. 8. a celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as such.
  6. 12. a small rocky body orbiting the sun
  7. 13. a planet whose orbit lies outside the asteroid belt
  8. 14. a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
  9. 17. a theorized group of icy objects collectively called the Oort Cloud coast along their orbits like lazy moths around a porch light.
  10. 20. refers to a celestial object passing in front of another
  11. 22. when two satellites have orbital periods that are related by integer relationships