PLANETS!!! :) !!!
Q: Do you remember the planets of our Solar System? A: Mercury- Venus- Earth- Mars- Jupiter- Saturn- Uranus- Neptune- ... Debate: Is Pluto a dwarf planet or should it be restored to its original planetary status? Maybe the NEW HORIZONS will reveal the truth!!! ;) Fun Fact! Neptune was the first planet discovered by mathematical calculation rather than empirical observation. Pluto: 1/6 Earth's mass; 1/3 Earth's volume; 50-70%rock ( at its core) and 30-50% ice ( as the mantle) with a 100-180km sub-surface ocean layer at the core-mantle boundary. Surface is 98% frozen nitrogen with traces of methane and carbon monoxide.