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A Cosmic Ring That Appeared Out of Nowhere

The Herschel Space Observatory managed to get a picture of a cosmic ring in the huge cloud of gas and dust called NGC 7538. Normally, rings like this are caused by the winds of O-type stars or by their supernovae. But there's no O-type star remnant at the center of this ring. Did a star blow this bubble and then move… » 4/06/15 1:30am 4/06/15 1:30am

Astronomers have spotted water plumes on dwarf planet Ceres

We've observed water on Ceres. The largest object in the asteroid belt, you may remember Ceres as the round, rock-ice body that was considered for reclassification as a planet in the midst of Pluto's demotion. Astronomers observed the water in the form of vapor plumes, possibly issuing from volcano-like geysers on… » 1/22/14 6:00pm 1/22/14 6:00pm