The probe itself that smashed into the comet had sensors/cameras and the craft it separated from also had them as it flew past watching the impact/scattering of debris. The reason it looks like such a big explosion is that spacecraft travel at thousands/tens of thousands of miles per hour and comets arent the most solid of objects (rock/ice snowballs basically) so the combination of the two made for a very large spash.
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We Must Dissent.
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