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The mystery of why Mercury 's magnetic field is so weak may just have been solved: It is being stifled by the solar wind, researchers think. [More]

As Congress gears up for another budget fight, environmental protections--from endangered species to clean water to pollution rules for power plants--are all on the chopping block. Once the debt ceiling debate is settled, Congress is going to have to re-focus on the budget that almost shut down the government a few months ago

Pluto may not be a full-fledged planet anymore, but it's got its share of moons. Including a tiny moon just recently spotted by astronomers.

Dear EarthTalk : I thought “farm raised” was the way to go when buying fish, to avoid mercury contamination. But are there other concerns about farm-raised that make some fish a poor choice for good health? What are the safest fish to buy and which should be avoided

Dear EarthTalk : Is it true that only a handful of outdated coal-burning power plants emit a sizable amount of the mercury pollution generated in the U.S.? If so, is anything being done to clean these sites up or shut them down? --Frank Pearson, Wichita, Kans

A NASA spacecraft has captured the first-ever image of Mercury taken from orbit around the planet.

On March 17, after a roundabout, nearly seven-year journey, NASA's MESSENGER probe became the first spacecraft to orbit Mercury , the closest planet to the sun.