Demo
    A commercial airliner seen from directly below, flying in a clear blue sky, with prominent contrails extending from its wings.
    During a series of NASA test flights, this DC-8 compared JP-8 jet fuel to a 50-50 blend with a renewable alternative fuel. Some scientists working for NASA say they’ve started changing the language but not the goals of their research to avoid triggering criticism.
    A satellite with solar panels and a laser beam extends from it against the backdrop of earth from space.
    NASA’s Gravity Recovery and Climate Experiment Follow-On would consist of two satellites flown in tandem to document the changing mass of features including ice sheets, glaciers and aquifers. Just as in the first GRACE mission, the tandem will pass radio waves between each other to measure the distance between the pair, which varies with variations in the pull of gravity. GRACE FO also would test a laser ranging system developed in collaboration with the German Aerospace Center, DLR, for even more accurate measurements.