This implies a history where everything was closer together. 2) The properties of the cosmic microwave background radiation (CMB). This shows that the universe went through a transition from an ...

setting a limit of 4 millirem per year of radiation exposure. However, because Ohio’s routine water testing does not include Tc-99, there is no way to determine whether local water supplies exceed ...

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Radiotherapy, or radiation therapy, is the clinical use of high energy rays (ionizing radiation) to induce DNA damage in all exposed cells to ultimately kill cancer cells or prevent cancer growth.

From decades of astronomical observations, scientists know that most galaxies contain massive black holes at their centers. The gas and dust falling into these black holes liberates an enormous ...