In the previous post I made a mistake about Ceres and its classification as an asteroid or dwarf planet. It’s been a topic of debate for some time, the debate originating with Pluto and its classification from planet to perhaps an asteroid and back to dwarf planet. Everybody was once sitting pretty thinking that Pluto [...]

ENCORE While the Kepler spacecraft hunts for habitable planets beyond the solar system, we’ve let one of our own planets slip away! Find out why Pluto’s demotion to dwarf status created a public uproar as astrophysicist Neil deGrasse Tyson reads us his hate mail. From third-graders! Also, how we might find Earth-like planets… the possibility [...]