The Enigmatic Glow of Hessdalen

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Across
  1. 3. Electricity resulting from pressure.
  2. 5. Based on or consisting of reports or observations of usually unscientific observers.
  3. 6. Occurring at irregular intervals or only in a few places; scattered or isolated.
  4. 10. Something difficult or impossible to understand or explain.
  5. 11. Scandinavian country where Hessdalen is located.
  6. 12. Difficult to find, catch, or achieve.
  7. 14. Based on or characterized by the methods and principles of science.
  8. 17. Emitting or reflecting light; glowing.
  9. 18. A radioactive gaseous element.
  10. 19. Mysterious and difficult to understand.
Down
  1. 1. Valley in Norway known for mysterious lights.
  2. 2. An ionized gas consisting of positive ions and free electrons in proportions resulting in more or less no overall electric charge.
  3. 4. Originating or existing outside the earth and its atmosphere.
  4. 7. A formal or systematic examination or inquiry.
  5. 8. A planned piece of work that is designed to find information about something.
  6. 9. A system for detecting the presence, direction, distance, and speed of aircraft, ships, and other objects.
  7. 13. Luminous phenomena observed in the sky.
  8. 14. An instance of seeing something, especially something unusual or rare.
  9. 15. Unidentified flying object.
  10. 16. The process of decomposing or rotting.