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            "release_date": "2015-07-29T10:00:00-04:00",
            "update_date": "2015-08-10T13:24:16-04:00",
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                "media_type": "Image",
                "alt_text": "Rotating asteroids have a tough time sticking to their orbits. Their surfaces heat up during the day and cool down at night, giving off radiation that can act as a sort of mini-thruster. This force, called the Yarkovsky effect, can cause rotating asteroids to drift widely over time, making it hard for scientists to predict their long-term risk to Earth. Watch this video on the NASAexplorer YouTube channel.For complete transcript, click here.",
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