Cassini Flies By Earth

The mystery of why Earth has so much water, allowing our “blue marble” to support an astounding array of life, is clearer with new research into comets.

NASA's Mars 2020 spacecraft has completed acoustic and thermal vacuum testing.

NASA announced the selection of a company to develop and demonstrate power, propulsion and communications capabilities for NASA’s lunar Gateway.

Former Jet Propulsion Laboratory Director Edward Stone — currently the David Morrisroe Professor of Physics at Caltech and the project scientist for NASA's Voyager mission for the past 47 years — has been awarded the prestigious Shaw Prize in Astronomy.

From now till Sept. 30, the public can submit names to be etched on microchips that will fly on the Mars 2020 rover and receive a souvenir boarding pass.

NASA's Juno mission to Jupiter made the first definitive detection of a planetary magnetic field that changes over time, a phenomenon called secular variation.