March 21, 2016
Artist impression of the hypothetical ninth planet of the Solar system. Proposed by famed planet-hunter Mike Brown and Konstantin Batygin, this hypothetical planet could lie in the far reaches of the Solar system, flinging dwarf planets like 90377 Sedna into oddly eccentric orbits.
The Planetary Fund
Help us accelerate progress in our four core enterprises: Robotic Space Exploration, Human Space Exploration, Planetary Defense, and The Search for Life.