The status of Pluto not withstanding, our solar system has 8 planets, but one astronomer believes we used to have a ninth ...

The “second-generation” world, predicted from telescope data, could be the first known planet of its kind, and it may shed ...

Caltech researchers reveal solar mass loss during red giant phase triggers outer solar system instability via stochastic ...

A study accepted to The Astrophysical Journal Letters finds the giant planets could be thrown into chaos about a billion ...

Modelling suggests that the planets’ orbits will become destabilized inside one billion years once the Sun starts to shed ...

For more than three centuries, astronomers asking whether the Solar System is stable have received ever more comforting ...

Rocky planet formation may be revealed by volatile depletion—a new study links the loss of volatiles to “hybrid accretion.” ...

Billions of exoplanets are believed to be out there awaiting discovery. AI—with its ability to sift through mountains of data ...

New simulations show 90% chance of outer solar system disintegration within 1 billion years after Sun becomes a white dwarf. ...

According to a new study, the Solar System may break apart within about 6 billion years as the dying Sun’s uneven mass loss destabilizes the outer planets.

Simulations suggest planetary orbits could destabilize within one billion years after the Sun begins losing mass, potentially ...

A new study suggests that our solar system’s smallest planet has shrunk by up to 30 percent since its birth roughly 4.5 billion years ago ...