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