{
    "count": 5,
    "next": null,
    "previous": null,
    "results": [
        {
            "id": 10229,
            "url": "https://svs.gsfc.nasa.gov/10229/",
            "result_type": "Produced Video",
            "release_date": "2008-08-22T00:00:00-04:00",
            "title": "HST SM4 ACS Repair EVA",
            "description": "Advanced Camera for Surveys (ACS) produced many of the most popular and dramatic images from the Hubble Space Telescope over the last few years, but in January 2007 the instrument had a serious power failure which caused the three observing channels, the Wide Field Channel, The Solar Blind Channel and the High Resolution channel, to cease operation. The Solar Blind Channel was returned to service in February 2007. This animation shows how the Servicing Mission 4 astronauts will attempt to repair the Advanced Camera for Surveys by replacing the CCD electronics box in the Wide Field Channel and power this box with a replacement low voltage power supply. If this repair is successful, ACS will again provide the most sensitive images available at visible and near-infrared wavelengths. || ",
            "hits": 25
        },
        {
            "id": 10233,
            "url": "https://svs.gsfc.nasa.gov/10233/",
            "result_type": "Produced Video",
            "release_date": "2008-08-22T00:00:00-04:00",
            "title": "HST SM4 WFC3 Installation EVA",
            "description": "Wide Field Camera 3 (WFC3) will have a broad range of inquiry, from early and distant galaxies beyond Hubble's current reach, to more nearby galaxies with \"stories to tell\" about their star formation histories, to the planets in our solar system. Along the way, \"dark energy\" will be seriously probed by WFC3. The instrument's key feature is its ability to span the electromagnetic spectrum from the near ultraviolet through the optical (to which our eyes are sensitive), and into the near infrared. WFC3 is the only Hubble instrument with this \"panchromatic\" capability. WFC3's strengths complement those of the Advanced Camera for Surveys (ACS) should it be repaired. Working together these two instruments could create the greatest era in the spectacular history of Hubble imaging. The Servicing Mission 4 astronauts will remove the Wide Field Planetary Camera 2 (WFPC2) installed during Servicing Mission 1 in 1993 and install the WFC3 in its place. || ",
            "hits": 13
        },
        {
            "id": 10234,
            "url": "https://svs.gsfc.nasa.gov/10234/",
            "result_type": "Produced Video",
            "release_date": "2008-08-22T00:00:00-04:00",
            "title": "HST SM4 RSU / Gyroscope Replacement EVA",
            "description": "Hubble was designed to use three of six onboard gyroscopes to meet its very precise pointing requirements, with the other three held as spares. Gyros have limited lifetimes, and three of the six (all installed in late-1999) are currently working. Following a thorough analysis and testing by engineers, it was determined that Hubble could operate productively on two gyros. After the implementation of three new control modes in Hubble's main computer, and major changes to Hubble's planning and scheduling system at the Space Telescope Science Institute, two-gyro operations began in 2005. By operating on two gyros, with the other gyro turned off (until needed), it is expected that Hubble can continue science operations through the end of 2008. With SM4 scheduled for mid-2008, a fresh set of six new gyros is needed to make the most of Hubble's new science instruments and lifetime peak performance through 2013. Each Rate Sensing Unit (RSU) contains two gyroscopes. Astronauts will replace all three RSUs giving Hubble a full compliment of six new gyroscopes. || ",
            "hits": 24
        },
        {
            "id": 10224,
            "url": "https://svs.gsfc.nasa.gov/10224/",
            "result_type": "Produced Video",
            "release_date": "2008-05-20T00:00:00-04:00",
            "title": "HST Advance Camera For Surveys Repair Scenario",
            "description": "Hubble's Advanced Camera for Surveys (ACS) was responsible for many of Hubble's most impressive images of deep space. In January 2007, ACS experienced an electrical short that put two of its three cameras out of commission. ACS contains a trio of cameras: the wide field camera, the high-resolution camera, and the solar blind camera. Each performed a specific function.This animation depicts the procedure planned to repair ACS. Astronauts will remove 4 circuit boards from inside the instrument, install a redesigned pack containing new circuit boards and then re-route the power going to the instrument. || ",
            "hits": 11
        },
        {
            "id": 10225,
            "url": "https://svs.gsfc.nasa.gov/10225/",
            "result_type": "Produced Video",
            "release_date": "2008-05-20T00:00:00-04:00",
            "title": "HST Advance Camera For Surveys Power Flow",
            "description": "Hubble's Advanced Camera for Surveys (ACS) was responsible for many of Hubble's most impressive images of deep space. In January 2007, ACS experienced an electrical short that put two of its three cameras out of commission. ACS contains a trio of cameras: the wide field camera, the high-resolution camera, and the solar blind camera. Each performed a specific function.This animation depicts the power flow before and after the SM4 crew services the instrument on orbit. || ",
            "hits": 16
        }
    ]
}