Astronomy Crossword

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Across
  1. 2. dwarf planet in the Kuiper belt, a ring of bodies beyond the orbit of Neptune
  2. 3. the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth
  3. 5. a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure. Modern astronomers divide the sky into eighty-eight constellations with defined boundaries.
  4. 7. a fundamental interaction which causes mutual attraction between all things that have mass
  5. 9. the fifth planet from the Sun and the largest in the Solar System
  6. 11. seventh planet from the Sun and is a gaseous cyan ice giant
  7. 14. a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere.
  8. 15. astronomical event that occurs when an astronomical object or spacecraft is temporarily obscured, by passing into the shadow of another body or by having another body pass between it and the viewer
  9. 17. a region of spacetime where gravity is so strong that nothing, including light or other electromagnetic waves, has enough energy to escape it.
  10. 19. an astronomical object comprising a luminous spheroid of plasma held together by self-gravity.
  11. 20. a physical theory that describes how the universe expanded from an initial state of high density and temperature
Down
  1. 1. an icy, small Solar System body that warms and begins to release gases when passing close to the Sun
  2. 4. all existing matter and space considered as a whole; the cosmos. it has been expanding since its creation in the Big Bang about 13 billion years ago.
  3. 6. a prominent pattern or group of stars, typically having a popular name but smaller than a constellation.
  4. 8. star at the center of the Solar System
  5. 10. a celestial body moving in an elliptical orbit around a star.
  6. 12. the point in the sky or celestial sphere directly above an observer.
  7. 13. the gravitationally bound system of the Sun and the objects that orbit it
  8. 16. a system of stars, stellar remnants, interstellar gas, dust, and dark matter bound together by gravity
  9. 18. the third planet from the Sun and the only astronomical object known to harbor life