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 ...

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 ...

Am I seeing spots before my eyes? New images from the Dawn spacecraft show lots more detail on the asteroid Ceres. We're getting closer and closer to Pluto. Asteroid / dwarf planet Ceres mystery white ...

This month binocular and small telescope observers of Colorado skies will have a unique opportunity to observe a peripheral player in the ongoing controversy over the status of the outer solar system ...

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 ...

Watch live online as the dwarf planet Ceres swoops in front of the 'grand design' spiral galaxy Messier 100 this weekend. When you purchase through links on our site, we may earn an affiliate ...

If you woke up Thursday morning and sensed something was different about the world around you, you’re absolutely right. Pluto is no longer a planet. The International Astronomical Union, wrapping up ...

The International Astronomical Union (IAU) defined a dwarf planet in 2006 as a celestial body that orbits the Sun, is round in shape, but has not cleared its orbital neighborhood of objects of ...

“My very excellent mother just served us nine.” It doesn’t quite work without “pizzas” at the end. Nor do other schoolchild mnemonics for remembering the planets of the solar system, now that Pluto ...

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Pluto, the king of the underworld, was the ancient Romans' embodiment of death itself. Known as Hades in Greek mythology, ...

This weekend, you can watch live as the first asteroid ever discovered passes across one of the night sky's most beautiful spiral galaxies. This weekend, Ceres will appear to "meet" the distant spiral ...