Now a new theory suggests a two- to 50-Jupiter-mass object passing through the solar system could be the cause. The evolution of the orbits of the planets is a complex process.

Some planets have fast orbits like Mercury, which orbits the sun every 88 days. Others have slow orbits like Neptune, which takes 165 years to complete one orbit.

A planet circling at a sharp 90-degree angle to the orbits of its two host stars has now been confirmed. This discovery challenges long-standing ideas about how planets form and orbit in the ...

Asteroids around Venus pose possible 'invisible threat' to Earth: Should you be worried? The giant space rocks are believed to be traveling in tandem with Venus as the planet orbits the sun ...

Right angle Illustration of 2M1510 showing the orbits of the two brown dwarfs (in blue) and that of the planet (in orange). (Courtesy: ESO/L Calçada) The first strong evidence for an exoplanet with an ...

The minor planet swings as far as 838 astronomical units (AU) from the Sun. For context, Earth sits at 1 AU, and Neptune, the most distant known planet, orbits at 30 AU.