Earth and Space: SKA Lecture Crossword Puzzle

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Across
  1. 3. location of the former largest radio telescope in the world
  2. 6. a hypothetical form of matter that makes up 85% of the known universe
  3. 7. a simple organic compound containing both a carboxyl (—COOH) and an amino (—NH2) group
  4. 8. a theoretical repulsive force that counteracts gravity
  5. 13. a telescope that specifically detects waves emitted when a hydrogen electron falls from the third lowest to the second lowest level
  6. 16. a rapidly rotating neutron star that emits pulses of radiation
  7. 17. increase in frequency and decrease in frequency as the source approaches or moves away from a point of reference, respectively
  8. 18. a region of space with such high gravity that no matter or radiation can escape
  9. 19. a group of stars that are gravitationally-bound
  10. 21. path of a body revolving around an attracting centre of mass
Down
  1. 1. a celestial body that orbits the sun with sufficient mass to assume hydro-static equilibrium
  2. 2. a branch of astronomy that studies the origin and evolution of the universe
  3. 4. the superposition of waves used to cause interference and extract information
  4. 5. an electromagnetic wave of a frequency between about 10^4 and 10^11 or 10^12 Hz
  5. 9. a superhero among computers/a very powerful computer
  6. 10. system of millions or billions of stars and gas and dust, held by a gravitational attraction
  7. 11. stretching of a wavelength such that it is shifted into the red spectrum
  8. 12. a period a few hundred million years after the Big Bang in which the first stars and galaxies began to from
  9. 14. a specialized antenna that receives radio waves
  10. 15. region where a force of magnetism acts
  11. 20. a luminous spheroid of plasma held together by its own gravity