2:
1. Earth's incredible neighbor...
2. Mars, the red planet...
3. Venus, a scorching inferno...
4. Jupiter, the giant gas giant...
5. Saturn's mesmerizing rings...
6. Neptune, the icy blue mystery...
7. Uranus, a sideways marvel...
8. Mercury, the blistering hot world...
9. Pluto, a dwarf planet's tale...