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This handout artist's concept provided by NASA/JPL shows the Comet Siding Spring approaching Mars, shown with NASA’s orbiters preparing to make science observations of this unique encounter. A pristine distant comet created a once-in-eight-million-year fireworks show on Mars and no humans were there to witness it.
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A protester holds a placard reading `Go playing away with your flashball, we keep an eye on you` during a march against police violence and in tribute to Remi Fraisse, a 21-year-old environmental activist who died during clashes between security forces and protesters of the Sivens dam project, in Paris, France.
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