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Understanding the hazards of space weather on crewed and robotic missions is vital to informing plans for NASA’s Journey to Mars and other missions into our solar system, and beyond. During this episode of the Smithsonian National Air and Space Museum series, What’s New in Aerospace, veteran NASA astronaut John Grunsfeld and solar experts discuss that and more. The event also marked the 10th anniversary of the launch of NASA’s two Solar TErrestrial RElations Observatory (STEREO) spacecraft. The twin probes have advanced space weather forecasting more than any other spacecraft or solar observatory and enabled previously impossible early warnings of threatening conditions posed by the sun.