1. Red Planet   Pluto   Mercury   Mars   Jupiter   Hint Half-n-half Clue   2. Largest planet of our solar system   Jupiter   Saturn   Neptune   Uranus   Half-n-half Clue   3. Most dense planet of our solar system   Saturn   Jupiter   Pluto   Earth   Half-n-half Clue   4. Brightest planet as viewed from the Earth   Mercury   Moon   Jupiter   Venus   Half-n-half Clue   5. Planet with most-tilted axis that seems to spin on its side   Saturn   Uranus   Jupiter   Neptune   Half-n-half Clue   6. Smallest planet of our solar system   Pluto   Venus   Mars   Mercury   Half-n-half Clue   7. Least dense planet of our solar system   Earth   Jupiter   Saturn   Pluto   Half-n-half Clue