There are eight official planets (sorry, Pluto) in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and ...

A few decades ago, the Solar System had nine planets, but in 2006 the International Astronomical Union reclassified Pluto as ...

The newcomer replacing Pluto presently goes by “Planet Nine.” If and when it finally shows up, it will get the honor of a ...

Smaller gas giants are less likely to survive in such systems, surrounded by clashing planetary titans. With their lower ...

The potential discovery of a large planet beyond Neptune’s orbit could change everything we know about the Solar System.

For centuries, humanity has gazed at the stars, unraveling the mysteries of celestial motion. But what if the unusual orbits ...

If Brown’s hidden world is real, Rubin will almost certainly find it or strong indirect evidence that it exists. “In the ...

Astronomers believe that our solar system may still hold surprises, with ongoing efforts to find a hidden ninth planet ... noticed unusual patterns in the orbits of several objects beyond Neptune.

For billions of years, it's kept our star system well organized ... flybys to explain eccentricities in the orbits of certain objects in the solar system. The solar system is approximately ...

Unlike the eight known planets, whose orbits align along the same plane ... One thing’s for sure: if the new Planet Nine is out there, its discovery could completely reshape our understanding of the ...

Scientists have discovered a rare six-planet system where all planets orbit their star in perfect mathematical harmony.