CH23 - Our Solar System - Crossword Labs

3. he applied gravity to planetary movement (first and last name)
5. most meteors ___ completely before reaching Earth's surface
7. he discovered that Venus has phases like the moon (fist and last name)
8. asteroids, comets, and meteoroids are all considered to be ___
10. these planets are similar to Earth. They are close to the sun and have rocky surfaces
13. mercury has high surface temperatures because of its ___ and distance from the sun
16. the collection of small solar system bodies that lie beyond Neptune's orbit
17. a planet displays this when it appears to stop its forward motion, move backwards, and then returns to its forward motion
19. generally, the main difference between an asteroid and a meteoroid is its ___
23. he proposed deferents and epicycles (last name)
26. Copernicus believed the Ptolemaic system was too ___ to represent the actual arrangement of the heavens
27. the most unusual feature of Uranus compared with the other planets in the solar system is its ___
29. this mission to Pluto and beyond is intended to provide evidence for the secular theories of the solar system's origins
30. a superior planet's retrograde motion is just an ___

1. he predicted a comet later named in his honor (first and last name)
2. the early assumption of the heliocentric theory that caused inaccuracies is that the planets moved in ___ orbits
4. the planet Mars is classified as ___ and terrestrial
6. only inferior planets are observed to pass in front of the sun, an event known as a ___
9. the planets that are beyond Earth's orbit are called ___ planets
11. the ___ lies between the orbits of Mars and Jupiter
12. he introduced the heliocentric model (last name)
14. the scientific name for a shooting star
15. the great philosophical shift in the importance of humans in the universe that followed acceptance of the heliocentric theory
18. because of its distance from the sun, this is the fastest revolving planet
20. he formulated the three laws of planetary motion (last name)
21. astronomers designate comets that appear two or more times as ___ comets
22. these planets are sometimes called the "gas giants"
24. certain Christian philosophers in the Middle Ages argued the ___ model agreed with the Bible because it seemed to support the central importance of man and the earth
25. this theory was useful because it provided a workable model of the sky and the most important objects in it
28. Saturn and the other gas giants are classified as ___ planets
31. planetary models were greatly improved by the precise and accurate observations of the astronomer ___ (first and last name)