Across the Universe

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Across
  1. 2. Apparent motion of the equinoxes along the ecliptic as Earth wobbles on its axis
  2. 7. Amount of mass which doesn’t reflect or emit any light (2)
  3. 8. Imaginary sphere with earth located at its center (2)
  4. 11. Shape of Earth according to Greek during 500BC
  5. 13. Planet visible to the eye
  6. 16. Observed the shadows that the Earth cast on the moon during a lunar eclipse to predict Earth’s shape
  7. 18. Gave the most accurate size of spherical Earth
  8. 22. Season that falls on Mar 21 – Jun 21
  9. 24. Eclipse when the moon passes directly between the sun and the earth
  10. 26. A unit of length equal to the distance that light would travel in a vacuum in one year
  11. 29. Apparent daily revolution of the celestial sphere around celestial poles (2)
  12. 33. Explained clearly than Aristarchus that Sun is center of universe
  13. 35. Study the universe overall & ask questions about the origin of everything
  14. 36. Earth-centered universe model
  15. 38. Shape of Earth according to Pythagoras & his pupils
  16. 39. Study of the physics of celestial bodies
  17. 42. Terrestrial motion that is innate characteristics of humans and animals
  18. 44. Causes the annual motion and changes to length of daytime & night time, & different seasons
  19. 45. Antenna pointed into space that allowed scientist to discover background radiation
  20. 46. Cycle in the sky which is based on seasons
  21. 48. The disappearance of these was one of the argument of Aristotle for a spherical Earth
  22. 49. Stars that keep changing position, aka planets
Down
  1. 1. Law that expresses the velocity at which a galaxy is speeding away from Earth
  2. 3. Size of the Earth to be approximately 25000 stadia
  3. 4. Because of these difference in which planet orbits the Sun, it creates the apparent retrograde motion
  4. 5. Due to this presence, gravity is actually causing space to expand and accelerate (2)
  5. 6. Equal to 3.26 light years
  6. 9. Added in the model of Aristotle, aka Cronos
  7. 10. Proposed that the universe is made of 27 concentric spheres
  8. 12. One of the elements in the terrestrial realm
  9. 14. imaginary line that the earth spins around (2)
  10. 15. The effect which occurs with light emitted by an object away from the Earth.
  11. 17. Days where the sun is the furthest away from the celestial equator
  12. 19. Not convinced by concentric spheres instead proposed sun-centered universe
  13. 20. Theorized that the universe began in a state of highly compressed hot ___
  14. 21. The line that the sun traces in its movement across the sky
  15. 23. Anticlockwise motion or normal motion of planets
  16. 25. Sun-centered universe model
  17. 27. Motion in the universe that is perfect & circular according to the ancient Greeks
  18. 28. Motivated his students to explain their observation on the movement of planets
  19. 30. The only celestial object that significantly changes appearance
  20. 31. Point that doesn’t move at all; experiences no lateral motion as the earth rotates (2)
  21. 32. Proposed by Eudoxos and Aristotle to be the center of the universe
  22. 34. Hemisphere that experiences longer days during winter since the axis of rotation is titled away
  23. 35. Shapes of stars that can be traced by connecting the dots
  24. 37. Theory developed by Russian-American physicists George Gamov (2)
  25. 40. Any of the planets whose orbit is further away from the Sun than the Earth’s
  26. 41. Proposed Earth-centered model of universe using concept of deferent instead of concentric spheres.
  27. 43. Means to move backward
  28. 47. When the sun crosses the celestial equator on Mar 21 or Sept 22