Essential facts about this distant dwarf world:
• Takes over 300 Earth years to orbit the Sun once
• Surface is coated in frozen methane pellets turned reddish by cosmic rays
• Its discovery helped trigger Pluto’s reclassification as a dwarf planet
• Orbited by MK2, a tiny moon as black as charcoal
• A single day lasts 22.8 hours—almost identical to Earth
