Answer: Saturn
Notes: Saturn is the least dense, while earth is most dense among all the planets. Its density is less than that of water. The average density of the planets in decreasing order is given below.
| Planet | Average Density (gm/cm3) |
| Earth | 5.5 |
| Mercury | 5.4 |
| Venus | 5.2 |
| Mars | 3.9 |
| Neptune | 1.6 |
| Jupiter | 1.3 |
| Uranus | 1.3 |
| Saturn | 0.7 |
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