Time

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Across
  1. 3. The fourth dimension of the universe.
  2. 6. _________ is all around us and is the basis of how we record life on Earth.
  3. 8. Time would speed up and slow down around cosmological bodies with different masses and _______________.
  4. 11. _________ ________ relies on the energy transition within an atom of a certain element.
  5. 13. One theory relies on the second law of _________________. This law states that everything in the universe tends to move from low to high entropy, or from uniformity to disorder.
  6. 15. There are two main ways of measuring time: _____________ and atomic time.
  7. 16. Modern clocks are using _________ to track and detect energy transitions within cesium atoms and keep a more definite measure of time.
  8. 17. 17th century physicist, saw time as an arrow fired from a bow, traveling in a direct, straight line and never deviating from its path.
  9. 19. Distant spinning neutron star that has been used to keep track of time.
  10. 20. A ___________ is now defined as 9,192,631,770 transitions within a cesium atom.
Down
  1. 1. One factor that contributes to the rate of Earths spinning not being uniform.
  2. 2. This element is commonly used for atomic time.
  3. 4. ______________ clocks promise twice as much accuracy as atomic clocks.
  4. 5. Although Newton and Einstein came up with conflicting theories to explain how time works, both scholars agreed that time moves only ___________.
  5. 7. Another theory suggests that the passage of time is due to our _____________ universe. As the universe expands, it pulls time with it because space and time are linked as one.
  6. 9. The speed of _____________ doesn't vary, but is a constant, traveling at 186,282 miles per second.
  7. 10. Physicists tested Einstein's theory by flying four cesium atomic clocks on __________ around the world.
  8. 12. The entire _____ system in orbit around Earth uses atomic clocks to accurately track positions and relay data to the plane.
  9. 14. The 1905 physicist that theorized that time speeds up and slows down.
  10. 18. The old definition of a second was based on the rotation of __________.