But the real nail in the planetary coffin came in 2005, when astronomer Mike Brown discovered Eris ... like Pluto or Ceres, ...

Because of this, Pluto no longer fit the definition of a full-fledged planet and was reclassified as a dwarf planet on August 24, 2006. In 2005, astronomers discovered Eris, a celestial body in ...

To avoid confusion, the IAU revised its definition of a planet, leading to Pluto’s demotion. Alongside Pluto, Eris was also classified as a dwarf planet under the new criteria. Pluto’s ...

Ceres is the littlest planet that no one knows about ... It's a lot of objects like Eris, like Pluto, like these other dwarf planets that are all the leftover chunks from the early solar system.

A blue atmosphere, smooth areas, and youthful mountain ranges - this dwarf planet is full of surprises. When NASA's New Horizons probe flew past Pluto in July 2015, the images it returned astonished ...

They got kicked out soon, but then when we started being able to see asteroids, Ceres, Vesta ... And if you are still a Pluto-is-a-planet holdout, like we were, [Michael]’s argument that ...

Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute With Pluto's "demotion" to dwarf planet status ... with bodies like Eris, Ceres and Pallas.

It takes Pluto slightly over 248 Earth years to orbit the sun, which means that on March 23, 2178, one Plutonian year will have elapsed since the dwarf planet ... same honor on Eris, a Kuiper ...

For one thing, Eris shares the region and isn't stuck in Pluto's orbit. The end result? Pluto is bumped from "planet" to "dwarf planet." Now, Stern argues that a dwarf planet is a kind of planet.

He called this hypothetical world "Planet X." "In some ways, Pluto's more of a planet than some of the other established planets, like Mercury." ...

Saturn, Venus, Neptune, Uranus, Jupiter, Mars and Mercury will be visible in an uncommon planetary alignment this month.

There are also five additional celestial bodies called dwarf planets, including Pluto, Ceres, Eris, Haumea and Makemake. Grad student discovers planet orbiting around nearby star, astronomers say ...