The debate over Pluto’s planetary status has been ongoing since its reclassification as a “dwarf planet” in 2006 by the ...

With a diameter of 1,440 miles, Pluto is farthest from the sun. While major planets make roughly circular orbits, Pluto ...

Pluto, once considered the ninth planet of our solar system, has been a topic of intrigue since its reclassification as a ...

On Aug. 24, 2006, the International Astronomical Union (IAU) decided that Pluto wasn't a planet anymore. Instead, Pluto is ...

In Roman mythology, Pluto is the god and ruler of the dead. For a return mission to the dwarf planet, Howett and her ...

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

The discovery stoked the planet debate, which had been simmering since Pluto was spotted in 1930. For years, Pluto's inclusion in the solar system has been controversial.

New discoveries of objects in the Kuiper Belt have also presented challenges for the Planet Nine theory. The latest is known ...

Pluto was quickly heralded as the ninth planet in the solar system when it was spotted Feb. 18, 1930 by Clyde Tombaugh, a young amateur astronomer at Lowell Observatory.