1. Thought all planets have water
2. Thought all planets have atmospheres
3. Thought all planets are barren, like the moon
4. Thought all planets have moons
5. Thought all planets have one moon each
6. Thought all planets have the same orbital inclinations
7. Thought all planets orbit in random planes
8. Thought all planets orbit the Sun in plane of ecliptic
9. Thought all planets have the same orbital eccentricity
10. Thought all planets have circular orbits around the Sun
11. Thought all planets have the same axis tilt as the Earth
12. Thought all planets have their rotation axes perpendicular to the plane of their orbit
13. Thought all planets have the same atmosphere as the Earth
14. Thought all planets have same terrestrial properties as Earth
15. Thought all planets have magnetic fields
16. Thought all planets have magnetic poles located at their rotation poles
17. Thought all planets have similar chemical composition
18. Thought all planets have similar densities
19. Thought all planets have sold cores
20. Thought all planets have frozen cores
21. Thought all planets have 24-hour days
22. Thought all planets have prograde rotation
23. Thought all planets are same size
24. Thought all planets move in constant-speed orbits around Sun
25. Thought all planets orbit the Sun in a fixed line
26. Thought all planets have 365 days per year
27. Thought all planets move at same speed
28. Thought all planets have surface temperatures similar to that of Earth
29. Thought all planets are extremely hot
30. Thought all planets were known for hundreds of years
31. Thought all planets were discovered by scientific reasoning and calculation
32. Thought all planets were discovered by accidental observation
33. Thought all planets reflect equal amounts of light (not clear whether this is per surface areas or in total)
34. Thought all planets twinkle
35. Thought all planets revolve around the Earth
36. Thought all planets go through a complete cycle of phases
37. Thought all planets are closer to Earth than they actually are
38. Thought all planets could support life
39. Thought all planets had different elements
40. Thought all planets have rigid rotation
41. Thought all planets orbit the Sun in one Earth year
42. Thought all planets revolve clockwise
43. Thought all planets rotate clockwise
44. Thought all planets reflect the same amount of light
45. Thought all planets are in our solar system or there are none known beyond the solar system
46. Thought all planets have a nearly constant temperature
47. Thought all planetary magnetic fields are centered on the center of the planet
48. Thought all planets give off their own light and do not reflect
49. Thought all planets have solid surfaces
50. Thought all planets have a year that is longer than its day
1. Thought no planets go through phases
2. Thought no planets has more than one moon
3. Thought no planets orbited in nearly the same plane
4. Thought no planet has an axis tilt such that it is "upside down"
5. Thought no planet experiences retrograde motion
6. Thought no planet outputs energy of its own
7. Thought no planet experience retrograde motion
1. Thought only planets have volcanos
2. Thought only planets could have atmospheres
3. Thought only planets orbit the Sun
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