Researcher studies possibility of metal snow on Venus
Is it snowing metal on Venus? Erika Kohler is trying to find out.
Data shows fewer tornado days in U.S. but more per event over past couple decades
MAVEN studies passing comet and its effects
NASA's newest orbiter at Mars, MAVEN, took precautions to avoid harm from a dust-spewing comet that flew near Mars today and is studying the flyby's effects on the Red Planet's atmosphere.