PLANET X HAS NOT BEEN DIRECTLY OBSERVED · HYPOTHETICAL OBJECT
~5–10 M⊕
POSSIBLE MASS RANGE
~400–800 AU
POSSIBLE ORBITAL DISTANCE
HUNDREDS OF YEARS
POSSIBLE ORBITAL PERIOD
UNKNOWN
DIAMETER
UNKNOWN
COMPOSITION
UNCONFIRMED
EXISTENCE
THE SEARCH FOR A HIDDEN WORLD
Planet X is a hypothetical planet that
may exist far beyond Neptune.
The modern Planet X hypothesis is closely
related to the idea of "Planet Nine".
Researchers proposed that the unusual
orbits of several distant trans-Neptunian
objects could be explained by the gravity
of a large, currently undiscovered planet.
The proposed object would be extremely
far from the Sun. Because of this enormous
distance, it would receive very little
sunlight and would be exceptionally faint
from Earth.
Scientists have not directly detected
Planet Nine, and its existence remains
unconfirmed.
The search continues using powerful
ground-based telescopes and astronomical
surveys.
PLANET X FEATURES
GRAVITATIONAL CLUES
The hypothesis is based partly on unusual
orbital patterns observed among distant
objects beyond Neptune.
EXTREME DISTANCE
If it exists, Planet Nine would orbit
hundreds of astronomical units from the
Sun, far beyond the known planets.
NOT DISCOVERED
No telescope has yet produced a confirmed
direct observation of the proposed planet.
DID YOU KNOW?
If Planet Nine exists, it could be
farther from the Sun than any
known planet in our Solar System.
PLANET X, PLANET NINE AND THE EVIDENCE
“Planet X” is a historical name used for hypothetical undiscovered planets beyond the known major planets. In modern research, the specific Planet Nine hypothesis proposes a distant massive planet as one possible explanation for patterns reported in the orbits of some trans-Neptunian objects.
No Planet Nine has been directly detected. Researchers continue to test whether the orbital patterns are statistically robust and whether they could instead arise from observational biases, the known planets or other dynamical effects. Until a planet is observed and independently confirmed, it remains a hypothesis.
CONCEPTUAL VISUALIZATION · PLANET NINE
ORBONIX · SOLAR SYSTEM
ORBONIX · SOLAR SYSTEM