Earth Science Work
emy (about a.d. 140), planets moved in great circles and smaller circles around Earth. The smaller ... Astronomers classify planets into two groups based on their distance from the sun: the inner planets and the outer planets (see Fig. 20-10).
| Title | : | Earth Science Work |
| Author | : | Constantine Constant |
| Publisher | : | - 1994-01-01 |
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