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"Absolutely anything" would of course include Greer and at least one of his marks with flashlights. Or Klingons even.
Probably some technical artifact, as in camera glitch or missing data, but yeah, it could be lots of things.
Edit: Hmmm. Upon actually following the link, I see it's pretty interesting. Seems to be something real reflecting light. Now to actually read the story. Heh.
http://data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBxQTEhUUEhQWFhQXGBYXGBYXFxoUGBUXGBQWFxQVGBcYHCggGBolHBUUITEhJSkrLi4uFx8zODMsNygtLiwBCgoKDg0OFA8PFCwcFBwsLCwsLCwsLCwsLCwrLCwsLCwsLDcsLCw3LCwsLCssNywrNyw3NzcsLCs3Kyw3NywsLP/AABEIAMIBAwMBIgACEQEDEQH/xAAcAAACAgMBAQAAAAAAAAAAAAAAAQIFAwQGBwj/xAA/EAABAwIDBQYEBAQDCQAAAAABAAIRAyEEMUEFElFhcQYigZGh8BOxwdEHMlLhFCNC8RVDgiQzNGJyk6LC0v/EABcBAQEBAQAAAAAAAAAAAAAAAAABAgP/xAAbEQEBAQADAQEAAAAAAAAAAAAAARECEiFBMf/aAAwDAQACEQMRAD8A8Pa2SBxtew8Tog+vogj3KSDLRDTO+4thpLYbvS7RpuIBve/RYoQhAKQfYi0Eg5CbTrnF8lFAQCAhMFAEJJykgYWTDYd9R26xpc6HGGiTDWlzj4BpPgsQKnSqFpltjfnmIOfIoIykhCAQmCkgZKSaSATQUAoEhNJAJgoIQQgSaPfzU9wbs7w3pjdgzEfmnLlCBVAAbGRa46CbHxUEJ2jmgIRCAUkAmEW99fskgEKW7zHr9kIIqRdE5fMJBJAIQs1LEua17GmGvjeH6t0y3yKDESkghCAQmSkgEykhAIQiEDKmyi4tc4AlrY3jo2TAnqsaYHH3wQIoUmtmcrCc4m4FuJv81FAyEkJg8ECQhZqWHc7IGJQYgkrqj2crO0z9VnodnKgMPbZBSYdkmIVg7Y5if2V/hNiimclYYvDDdiEHntSmQYKiV0uO2e0DeOa57E1JPJBiQmD7+SSBykghCBykpN9B4cEgEAhCECQm5A5oEmRl6+9EgUIBNJMIEmCmLQooBNIJkIApIQgZHBEJBZTQO5vy2N4tjeG9IAM7ucXzQYkJjmgFACLeqScJFAyut7M4MuZ3WyOPHouSaF0XZLaJpV27xO6bQPog7jZ2CFQ7swdNOoXQUsDuiHiY14qOCwDLOY3dabyTryV13d25k5RxKCufsdtRstC1zsLukEfsuq2fQMT6LVxzXB1jM5jgAg8s7Q7DcAeC5T/CwDBXq3aEDdIC4rGUw2Sg5vGYFrWkqnKsdsYkkwq1AyEkJtQCYPjyPyQQkgEIQgSbXRcZgyCglJBKrULiXOMkkkniSZJUUJgIEhCJQCaSEAhMqVJ0EGAYIMESHQcjyQQQm52ek6DLog6xl80CT3TExbKdJOQnwPkp0KDnmGiSuk2f2NqOAdUdui1gJJnISdeWaDl0L0fCdh6IjeDndT/8q1w/YjCnOlr+pxECxJy15IPJJSXr+I7C4Q5U/J5H1hVGN/DUFu9SqOZrFQS09DY/NB57QrRmJBi1tMrwus7HYbD1S4vcG7t902McQdVUbW7OYnC/75h+EYl7e8w8L5jPWFLBYGajfgNc4nJpvHkg9l2W9oLB/RZoOYK6X/Amuqte4C1wOBjP0Vf2U2K9lBjqoglrSQYsVdU3uqb4JAAsCDdw58EGb4e64ic/GFrYqoxstzJHTwWvi8UA4sBJdYT4Zqmw9T+cWPJIEd42z4eKDle1GOO8WtEG/wCy47GOefzZL1LthselUZ/LB3s5nVeZ4phEg6ZhBylWgXOcdBqtR7RxVjtV0GBYKtKABUqbSSAASSQABcknIAalRUmOi4z0PBA3tIJDgQQSCMiCMxByKgmXXk36pIJBnMeaaVuaEEEwUkIJfDO7vQd2YmLSBJE8YIUUJgIEVJ5kkxzgCw+wUUw4jI8vDggISCEIGUAe+KCPfvwQAgS3tmbNdWPdFvmeC1sNQL3BozJA8SYXouApso0mNYO8RfjefIx5II7C2O2mYEFw9D7N/wC66YYb9JkiBMWki5A1K1dlYEw1okG7nWuQCBlp0XQOwsHjEZXvnHM55JQ2YKwFzxyAA4DmrLB0C64b3chexOgH7BJuCaAC4nSY/qMZdPmrajVhgH5W6R0i3DNY7NdTZhWhoDmuk5CCbeNvLJWA2cC2SW8LWzj7BY8NiAdbDOb+ytluKygfRanKfWbxvxS47ARIdcatcLARkZzlUOwewdAYh9amXMAF6TQC2eIGYtaMrrtMTTDged1DChzAd0RNpFnWU/KrFX2vTZ3Xu3YgCRGmUnVYaeLp73dIvwIPmuD/ABawNU0v4mi538sRVpzYg/5sRmNes6LxyjtZ4cSXvkmZDi1WXUfSVdoFQv4wOviuI7VOqmu003QAHSOIDrHrdUWzu2ralH4deoTNp/qHXryWptTtWymG7j/iPbFyAQRORBsR14KjuNn4wwN+TzK4/tRR3a5gWcA7wNwVot7cE05IE5bv7aqr2j2la8Ahve8kGrttjRmufW5iMeXyCBBi8SWx+nqtSEEt8xE2zjSePWyihCAQEFCAQhCAIUiwgSYvl55+hUE2i4+uXigSEwFMtvEEcigxqQA155ei2Bg3RMLLszZ5qOIOQz+yDQQr7E4FsRlCra2EjJBpoTKnh2S4BBb7BwTnODgLDXgdT5SvRNjYanDX5kjdH/MXwbeXyXPbFpNbSYP1Mn/UbknwaF0ux8OW02C28AbcL90dAI8glF7s6iXOsIEiYGcaE6xIzXSUcKIgC4yz4anVaWwaLWgAiZ3ZOuQn5LoqDz8KXBoeZkNM2kxJ6RKdfE31VtoQCc4HCQOY9VjpSXH9MX5m3sqzEwRobeQusLnAacffmuVdYx03SYA96qxpiBJC0qDxvE6BWVOsNYNstFUTYLcDmoBxIMz9/wC/0Ta8jS8LNTE5gi30uZ800xTYrDioHBzfzAhwNwQZBHQhfMvafZX8Liq1C8Med0nVhuw9d0hfVzqIMwbR9YXhn437LAq0cQ0fnBpu/wBPeYfIuH+kK8b6leYJyhELbJKdKLyYsecnQKKAUDLREg3mN28jK85f2UU0IAJyjRJAIQglAITlCBAJhqKboK3WU5IjXRBY7M2H3pfdto0Vpjtks/MQJC2Kdb4bWg5ALPh3fGBQaeFw7TDQBdWGzNlBjjbWVYbL2UW3IVw6gEHH7Twnf5Ki2xgnSD6rt8bhAXWGSpdrUCYbZByuI2SQzeaQSNOKr6FnLsaGD6Kk2rgAHFwBB9Cgv9i1g5tLkIPgIt4gLrcJiC0tHI87Tl6HzXDdnX/l5d7qDLT1vddNQrd8AiQc75RAPQWurYmuy2XjTaDElpHGJmPGyvhje9GlyuSwpDHZ3loDhcQQIHiZV5QH5g605dcj4LNrUi5q17ARBiZ48uX7rWpNJNug6ytVzSBI8dZ4LaoVHlwgi0dNN6Y1z9FhpsMZBjzHArdi3p16KvbNheVZYIEkbwg5ewgzNI109+C28OZk/SBGgjXMrBWOTWjkIgRoTxOYWak7dsfCc7aws3YT1hq910/0gREREEj7+a8h/G7/AIWlyrgD/tPP1C9Zx9XTmCR0uPVeLfjjjR/s1IZ9+q4a3hjT6O8lriV5UAkhC6MBCE3NhAE6IhKE4QCChOUCQhCAQnve4CaBMibzHLNXuwMPIDnZTZUIXT7MxTSwAWPBBsbTAM7rrhbnZmlUbIcNAc5zEj0Ko8YC2SrvYleGyTEoOvwNaQQijWMEHj/ZVuAxEuMHu6FZNwgl3H5INnGMtKo8c4EHQhW38VvAhc3tOg+QWXgmRxCDRxGIjUqn2hjpPdmOa2sRigA4PEEZBUJKC92dXEMI03mnlvcPL0XaYZ4Li7XdAnloOuflyXmuCxG46+RsV2OxMaIiZi3UaddfZWkdlgKm64HQnyMAfQK6r78BxJOV89FzmCAcImLgjqDcHl+6vRjrmeW9mYMAAgyYaYvaLhc7GpVlh629Z0wQY/fzW5hmXEXuJjMX81o4WdRwtblbmt1tQTAdcwOdyBfkpmrrZL5fYwALlXmFiGzcgSDl1mfcLnKTYuYNstD5LJh9puB3d5t9IufCeS1mM7q++IQ5zhEaaSTzKKVaXSedspIvAWtiMad3u2nWL5acSsIqhveMTl940CxWo2MW+JJgE3PK1/QegXzP2824MZjatUXpjuU/+hsgHoTLvFek/i32tFKn/DU3fzqgh7gQfh0zmOTnZdOFl4qtcYloQmUlpDHvySTISQCaAhBMU3EFwBIGZAsOvBQUg8xuyYzibTlMdJUYQCm7dgRO9eZiNN2PVQQgEIQgS38LtMsbAAnQ8ua0UAoLyhjXVASWiPqrDAvlt1yrKhGRV1snFbzs9Mig6vCYzdbAVnSxocIyXJ4mrAjWEsFj+6DMoOmLwJjP3K57ae0KjP24IrbUbmbH0VTtDau9bOff0KCtxuMLyZHitRTqOBNslBABb2zdoGm4at1WiSmg9I2PtAPG8wg8RnoNM10OExAcS6e9B3hMdL9R/wCQ4X8cw+Kcx28w7p5ZeS6XZ3bR7SDUBkR3mwSRwIOnir5UesYPFieHCB6cwCtvDYh7XTvFw4EdcohcXhO3GFqAb5DTkZaW/KytaXavBbsHENPVyDo6mKJIkwDxk9TM+7rbpVWCMpBJnw9VxY7ZYQf5zIGkE9IVdi/xKw9OfgtdUN8mhjZ5k39Cng9KfWyJsPH5arie2P4gU8NvU6ZFSsJhubWHIF5HD9Iv0XnG3e2+KxMje+Gz9LCQT1fmfCByXNQorNi8W+rUdUqOL3vJLnHMk6++Cwwho5x7yTaL8EEUIKEDjVMMJmASBc8hMSfMKKAgYQmkgE7dB5pJkoCUk288kkAhCECQgptjWdcrXi3qgSlTeQQRmFFCDbr7Qc4mDAIghYGViBEmFAIt78f2QN1QnMpJIQCcJBNzffNAkITDbwLoEnCN70WSvS3HFstdYXaQ4XANiPLzQY3FJCcoEnzSQgkMv29EkFJBImfAfX1zSKZyH2+uqQEoEmCkhAJoCfvggRKEIQNx/vqlCEIBMQknCBQhOEIIplJCAQs7aG80lgcd0S86NEgA+ZjyWBAJkJJgoABJOEAICE3cp0z46qKEDKSEBAKQcZB4RnfLKx0UU4QKEIU6NTdMwDnYiRcEIIJwlKEDSTASQCFICPfSUkCQhNAKTmQAZFxNjMXIvwNlFCBk+/GUkFOLSgER7CUIQSYwkwPtrGZySIg+yiUzy+6BIRCEEUJkqbKLiCQ1xAzIBIHU6IIJICCgE2+zwSUqdMuMNBJgmBewBJPgAT4IIrOawDAGhzXHeDzvWeCQWjd0AjnNuCwJgoEpPEGLGCbjI9EpRCCeHa0uAe7dbq6N6PDVY0yEIEpNFjfw4+ijCEAm3390EoLbTxQJCE4QJATCSAQhMIEpD39kkBAIQhBJxkkgQJy4cr3SCSAgExwSUiEABzjzukEJkoEmlCEEUw4jIkTY8xwQhAkBCEAhCEAhCEAhCEEqgv4D5BRQhAShCEAhCEBKEIQZqo/N1HyKwoQgEwkhA1J4s3p/7FNCCCJQhAIQhABMoQgaB9D8kIQNCEKj/9k= Very interesting re water on Ceres:
Water Plume Detected at Dwarf Planet Ceres : Discovery News
Ceres, plumes of water - Google Search