Pluto’s Planet Status could be Jeopardized by Sedna Discovery … 40317.html

Weird Object Beyond Pluto Gets Stranger … 40414.html

Scientists Find Another Huge Mini-World in Outer Solar System … 40315.html

Distant Sedna Raises Possibility of Another Earth-Sized Planet in Our Solar System … 40316.html

Controversial Proposal Would Boost Solar System’s Planet Tally to 12 … 30227.html