Astronomy Terms & Definitions.

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