Big Bang Crossword

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Across
  1. 3. An instrument used to measure the intensity or brightness of light.
  2. 8. The apparent shift in the position of a nearby object against a distant background when viewed from two different points. Astronomers use this to calculate distances to nearby stars.
  3. 12. The shortening of light toward shorter (bluer) wavelengths as an object moves toward the observer.
  4. 14. Matter composed of antiparticles, which have the same mass as ordinary particles but opposite physical charges.
  5. 15. The study of how heat and energy move around and change from one form to another.
  6. 16. Fusion The process where two light atomic nuclei combine to form a heavier nucleus, releasing massive amounts of energy.
  7. 18. A famous camera in space that orbits Earth to take clear pictures of stars and galaxies without the atmosphere getting in the way.
  8. 23. Vast, empty spaces between galaxy filaments that contain very few or no galaxies.
  9. 24. A point of infinite density and infinitesimal volume, such as the center of a black hole or the state of the universe at the exact moment of the Big Bang.
  10. 25. Hole A region of spacetime where gravity is so intense that nothing—not even light—has enough energy to escape its pull.
Down
  1. 1. Lines Specific dark or bright lines in an otherwise continuous spectrum, caused by atoms absorbing or emitting light at specific frequencies
  2. 2. A term often used to describe the hot, dense, and opaque state of the early universe shortly after the Big Bang.
  3. 4. A theory suggesting the universe underwent a period of extremely rapid exponential expansion in the first fractions of a second after the Big Bang.
  4. 5. Matter A mysterious form of matter that does not emit or absorb light but exerts a gravitational pull on visible matter.
  5. 6. The physical interaction between electrically charged particles, carried by photons, responsible for light, electricity, and magnetism.
  6. 7. The boundless three-dimensional extent in which objects and events have relative position and direction.
  7. 9. The precise density of matter and energy required for the universe to be "flat."
  8. 10. The stretching of light toward longer (redder) wavelengths as an object moves away from the observer.
  9. 11. A massive system of stars, stellar remnants, interstellar gas, dust, and dark matter, all bound together by gravity.
  10. 13. A physical quantity that expresses the average kinetic energy of the particles in a system.
  11. 17. The scientific study of the origin, evolution, and eventual fate of the universe.
  12. 19. The idea that the entire universe began as a single, tiny, hot point and has been expanding and cooling ever since.
  13. 20. The current epoch of the universe (following the Radiation Era) where the energy density of matter dominates over the energy density of radiation, allowing for the formation of large structures like galaxies.
  14. 21. The SI unit of thermodynamic temperature.
  15. 22. A pattern in the Cosmic Microwave Background radiation caused by the motion of our solar system relative to the rest of the universe.