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    "description": "Engineers and technicians prepare NASA's Cold Operable Lunar Deployable Arm (COLDArm) robotic arm system for testing in a thermal vacuum chamber at the agency's Jet Propulsion Laboratory in Southern California in November 2023.  Successful testing in this chamber, which was reduced to minus 292 F (minus 180 C), demonstrates the arm can withstand the conditions it would face on the surface of the Moon.  To operate in the cold, COLDArm combines several key new technologies: gears made of bulk metallic glass, which require no wet lubrication or heating; cold motor controllers that don't need to be kept warm in an electronics box near the core of the spacecraft, and a cryogenic six-axis force torque sensor that lets the arm \"feel\" what it's doing and make adjustments.  A variety of attachments and small instruments could go on the end of the arm, including a 3D-printed titanium scoop that could be used for collecting samples from a celestial body's surface. Like the arm on NASA's InSight Mars lander, COLDArm could deploy science instruments to the surface.  https://photojournal.jpl.nasa.gov/catalog/PIA26162",
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    "caption": "微重力流体实验台",
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    "title": "Fluid Physics",
    "description": "Colored oil flow toy was part of a student-designed apparatus used in the second Dropping in a Microgravity Environment (DIME) competition held April 23-25, 2002, at NASA's Glenn Research Center. Competitors included two teams from Sycamore High School, Cincinnati, OH, and one each from Bay High School, Bay Village, OH, and COSI Academy, Columbus, OH. DIME is part of NASA's education and outreach activities. Details are on line at http://microgravity.grc.nasa.gov/DIME_2002.html.",
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    "caption": "气体激光干涉测量装置",
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    "title": "Gas Laser Interferometer in the Electric Conversion Laboratory",
    "description": "Richard Lancashire operates a gas laser interferometer in the Electric Conversion Laboratory at the National Aeronautics and Space Administration (NASA) Lewis Research Center. Lewis was in the midst of a long-term effort to develop methods of delivering electrical power to spacecraft using nuclear, solar, or electrochemical technologies. Lancashire was measuring the thermionic diode’s plasma particle density. The thermionic diodes were being studied for possible use in radioisotope thermoelectric generators for use in space.    Microwave interferometry was one method of measuring transient plasmas. The interferometer measured the difference between the frequencies of two laser beams, one of which passed through the diode. The electron density was measured by revealing the phase shift of the transmitted microwave beam brought about by a change in the plasma refraction. Microwave interferometry, however, offers poor spatial resolution and has limited range of applicability.",
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    "caption": "材料实验炉测试设备",
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    "description": "Bill Davis performing checkout at the Materials Experiment Assembly (MEA) Isothermal Furnace.",
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    "caption": "声学试验舱与号筒",
    "credit": "NASA/Goddard/Chris Gunn",
    "title": "NASA Goddard's Acoustic Test Chamber",
    "description": "At Goddard, the engineers use the Acoustic Test Chamber, a 42-foot-tall chamber, with 6-foot-diameter speaker horns to replicate the launch environment. The horns use an altering flow of gaseous nitrogen to produce a sound level as high as 150 decibels for two-minute tests. That’s about the level of sound heard standing next to a jet engine during takeoff.  The 6-foot-wide horns in this 42-foot-tall chamber can produce noise at levels as high as 150 dB.  During the acoustics test, the speakers can still be heard outside of its insulated massive metal doors.   Credits: NASA/Goddard/Chris Gunn  <b><a href=\"http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html\" rel=\"nofollow\">NASA image use policy.</a></b>  <b><a href=\"http://www.nasa.gov/centers/goddard/home/index.html\" rel=\"nofollow\">NASA Goddard Space Flight Center</a></b> enables NASA’s mission through four scientific endeavors: Earth Science, Heliophysics, Solar System Exploration, and Astrophysics. Goddard plays a leading role in NASA’s accomplishments by contributing compelling scientific knowledge to advance the Agency’s mission.  <b>Follow us on <a href=\"http://twitter.com/NASAGoddardPix\" rel=\"nofollow\">Twitter</a></b>  <b>Like us on <a href=\"http://www.facebook.com/pages/Greenbelt-MD/NASA-Goddard/395013845897?ref=tsd\" rel=\"nofollow\">Facebook</a></b>  <b>Find us on <a href=\"http://instagrid.me/nasagoddard/?vm=grid\" rel=\"nofollow\">Instagram</a></b>",
    "source": "https://images-assets.nasa.gov/image/GSFC_20171208_Archive_e000622/GSFC_20171208_Archive_e000622~medium.jpg",
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    "caption": "微重力薄膜实验",
    "credit": "NASA/Don Pettit",
    "title": "Fluid Physics",
    "description": "Expedition 6 astronaut Dr. Don Pettit photographed a cube shaped wire frame supporting a thin film made from a water-soap solution during his Saturday Morning Science aboard the International Space Station’s (ISS) Destiny Laboratory. Food coloring was added to several faces to observe the effects of diffusion within the film. ",
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    "metadata": "https://images-api.nasa.gov/search?nasa_id=0601299",
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