Are the White Spots on Ceres Producing Afternoon Haze?

The mysterious white spots on Ceres have stepped up their game: from certain angles at certain times of day, they apparently produce a haze that partially covers their crater. If the observations are confirmed, it suggests the odd markings are ice directly sublimating into crater-filling haze. » 7/25/15 1:00pm 7/25/15 1:00pm

Pluto is Something Way More Awesome Than a Mere Planet

Stop hoping that Pluto will regain its former designation as a planet. It isn’t going to happen. But the good news is, Pluto is something much cooler than a mere planet. It’s the largest dwarf planet we know, and one half of the first binary planet system. Pluto didn’t get demoted, it got promoted. » 7/23/15 1:40pm 7/23/15 1:40pm

When We Discovered Pluto, It Changed How We Saw The Solar System

On the 23rd and 24th of January, 1930, a young astronomer working in Flagstaff, Arizona, scanned a small patch of the night sky. He was taking pictures of star positions, looking for anomalies that would signal movement somewhere at the edge of the solar system. He took the pictures then set them aside, not realizing… » 7/12/15 12:00pm 7/12/15 12:00pm

Pluto has regained its position as the ninth largest body to orbit the Sun. Probably.

When scientists first discovered the dwarf planet Eris back in 2005, they claimed that the icy body was actually larger than Pluto. But when Eris' orbit passed in front of a dim star late last year, astronomers got their first chance to take a good hard look at the dwarf planet's actual diameter. And as it turns out,… » 10/28/11 11:40am 10/28/11 11:40am