A kindergartener in 2005 and a kindergartener in 2006 would have learned very different facts about the number of planets in the solar system. 2006, of course, was the year Pluto was reclassified as a ...

Poor Pluto. On August 24, 2006 at the International Astronomy Union (IAU) General Assembly the ninth planet was scrubbed only 76 years after its discovery. Even weirder is that it actually got voted ...

Anyone who grew up learning that our solar system has nine planets probably remembers the moment Pluto got demoted. That ...

Unpopular opinion time, but someone has to say it: I think Pluto being reclassified as a dwarf planet was a great thing for our understanding of the solar system and for the former planet itself. Let ...

The first phase of the Pluto/Ceres conjunction brought us the Horizon oil rig disaster, and now as Ceres prepares to conjoin Pluto for the second time we have a “flood of red sludge” that could equal ...

Pluto hasn't been a planet for almost 20 years. In the early 2000s, scientists discovered several objects of a similar size to Pluto. So, during the summer of 2006, members of the International ...

Learn how Pluto nearly kept its planet status in a proposed 12-planet Solar System as its demotion marks its 20th anniversary. Eight days before Pluto lost its planetary status, it appeared ready to ...

In 2015, scientists got their best glimpse yet of dwarf planets, when two NASA spacecraft visited distant worlds. In March, the Dawn mission arrived at Ceres, which lies in the asteroid belt between ...

Pluto, Ceres, Eris, Makemake and Haumea have another possible candidate to consider for their dwarf planet squad. A team of researchers have discovered the new, tiny candidate deep within the Kuiper ...

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New images from NASA's Dawn spacecraft reveal lots more about this mysterious little world from the asteroid belt. These latest were taken on Feb. 4 from a distance of about 90,000 miles (145,000 km) ...