Astronomy Terms & Definitions.

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Across
  1. 3. The apparent path of the Sun across the sky.
  2. 4. A unit of distance in astronomy, equal to 3.26 light-years.
  3. 6. The sun and all the planets and other celestial bodies that orbit it.
  4. 7. An area of spacetime with such strong gravity that nothing, including light, can escape.
  5. 9. An instrument that collects and focuses light to magnify distant objects.
  6. 10. A natural satellite that orbits a planet.
  7. 11. A large system of stars, gas, and dust held together by gravity.
  8. 13. Giant A large, cool star that has exhausted its core hydrogen fuel.
  9. 14. A group of stars that form a recognizable pattern in the sky.
  10. 15. The study of celestial objects and phenomena.
  11. 17. The distance that light travels in one year.
  12. 18. A small, dense star that is the remnant of a star that has exhausted its fuel.
  13. 19. A celestial body made of ice, dust, and gas that orbits the Sun.
  14. 20. A rocky or metallic object that orbits the Sun, smaller than a planet.
Down
  1. 1. A cloud of gas and dust in space, often illuminated by nearby stars.
  2. 2. A luminous celestial body, typically a glowing sphere of plasma held together by its own gravity.
  3. 5. A measure of the intrinsic brightness of a celestial object.
  4. 8. A measure of the brightness of a celestial object as seen from Earth.
  5. 12. A celestial body that orbits a star and is not a star or a satellite.
  6. 16. The universe, seen as an orderly, harmonious whole