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