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The Gravity Recovery and Climate Experiment Follow-On (GRACE-FO) mission, shown in an artist's rendering, will measure tiny fluctuations in Earth's gravitational field to show how water moves around the planet. NASA/JPL hide caption

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NASA/JPL

NASA Launching New Satellites To Measure Earth's Lumpy Gravity

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The planet, known as Kepler-452b, was believed to be about 60 percent larger than our planet and within the habitable zone of its star. NASA Ames/JPL-Caltech/T. Pyle hide caption

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NASA Ames/JPL-Caltech/T. Pyle

Earth's 'Bigger, Older Cousin' Maybe Doesn't Even Exist

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An artist's rendering of what a Class V planet might look like under this new planetary classification system. Michael Osadciw/Courtesy of University of Rochester hide caption

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Michael Osadciw/Courtesy of University of Rochester

The goals of the planetary protection officer are to protect the Earth and to protect other planets from being contaminated by substances from Earth during exploration. NASA hide caption

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NASA

Do You Have What It Takes To Be NASA's Next Planetary Protection Officer?

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This composite of 30 images of asteroid 2014 JO25 was generated with radar data collected using NASA's Goldstone Solar System Radar in California's Mojave Desert. NASA/JPL-Caltech/GSSR hide caption

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NASA/JPL-Caltech/GSSR