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            "description": "See [NASA.gov](https://www.nasa.gov/nicer)",
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            "description": "The Neutron star Interior Composition Explorer (NICER) mission will study neutron stars, the densest known objects in the cosmos. These neutron star animations and graphics highlight some of their unique characteristics.For more information about NICER visit: nasa.gov/nicer. || ",
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                "alt_text": "This animation shows the size and scale of a neutron star over San Francisco. Neutron stars squeeze up to two solar masses into a city-size volume, giving rise to the highest stable densities known anywhere. The nature of matter under these conditions is a decades-old unsolved problem.",
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