Scientists plan for New Horizons probe's second act – Spaceflight Now
Why Isn't Pluto Considered a Planet? - The Atlantic
Space Discovery Sparks Debate: Is There Second Kuiper Belt in Solar System?
A new definition would add 102 planets to our solar system - including Pluto
Science opportunities with solar sailing smallsats – arXiv Vanity
Underworld Character Kicked Out of Planetary Family
Sort Out Your Space Rocks – National Geographic Education Blog
Planet Nine from Outer Space! – National Geographic Education Blog
Blog – Exoplanet Exploration: Planets Beyond our Solar System
A mysterious Mars-sized planet may be hiding at the edge of our solar system – The Denver Post
Scientists find evidence of new, unseen planet in solar system
Is Pluto a planet?
Goodbye, Pluto, Translation