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 ...

Nearly a decade ago, Pluto was stripped of its planetary status. But if you were alive two centuries ago, you could have been just as smug about Ceres, too. On March 6, NASA’s Dawn spacecraft will ...

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 ...

The word “planet” came from the ancient Greek words that mean “wandering star.” That makes sense, because for thousands of years, people have watched planets change position in the night sky – unlike ...

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 ...

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 ...

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 ...

Ceres is the largest 'asteroid' in our solar system, big enough that it's actually classified as a dwarf planet, like Pluto.

Artist's conception of the Dawn spacecraft approaching the dwarf planet Ceres. After a nine-year journey the New Horizons spacecraft is finally within reach of Pluto and will be close enough to start ...

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 ...

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