There may be another world lurking between the orbital lines of our solar system. Astronomers in Japan have published their theory of an “Earth-like planet,” dubbed Planet Nine, that’s ...

There have been questions about a mysterious ninth planet in our solar system for nearly a decade. Pluto was unseated as number nine in 2006. Now, a group of international researchers say they may ...

"The solar system’s distant reaches exhibit a wealth of anomalous dynamical structure, hinting at the presence of a yet-undetected, massive trans-Neptunian body — Planet 9," the study abstract ...

Almost 20 years after Pluto was infamously downgraded from its status as a planet, scientists now believe they have discovered a new planet in our solar system.

The Protoplanetary Disk and Planet Formation. Approximately 4.6 billion years ago, our solar system originated from a vast cloud of gas and dust known as the solar nebula.

The six found so far are roughly two to three times the size of Earth, but with densities closer to the gas giants in our own solar system. Pitts said most of the planets are smaller than Neptune.

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system. The object—which orbits out beyond Neptune—has been named "2017 ...

The age of the solar system is precisely determined as 4.54 billion years old, with a 1% uncertainty, using radiometric dating of terrestrial rocks, lunar samples, and meteorites.

For the first time, potential signs of the rainbow-like â glory effectâ have been detected on a planet outside our Solar System. Glory are colourful concentric rings of light that occur only ...

This process, called accretion, is how everything in the solar system – planets, moons, comets and asteroids – came into being. Telescopes can see young solar systems being born.

The quest to find hidden worlds. Searching for planets lurking in the frigid edges of our solar system is not a new concept. The so-called Planet Nine, a world 10 times more massive than Earth, is ...